Case Name: Timothy GUZICK, as Personal Representative of the Estate of George J. Nyberg and as Trustee of the George Nyberg Trust, Respondent, v. Larry KIMBALL, et al., Appellants. Colleen Bennett, Defendant
Court: Minnesota Supreme Court
Jurisdiction: Minnesota
Decision Date: 2015-08-31
Citations: 869 N.W.2d 42
Docket Number: No. A14-0429
Parties: Timothy GUZICK, as Personal Representative of the Estate of George J. Nyberg and as Trustee of the George Nyberg Trust, Respondent, v. Larry KIMBALL, et al., Appellants. Colleen Bennett, Defendant.
Judges: 
Reporter: North Western Reporter 2d
Volume: 869
Pages: 42–56

Head Matter:
Timothy GUZICK, as Personal Representative of the Estate of George J. Nyberg and as Trustee of the George Nyberg Trust, Respondent, v. Larry KIMBALL, et al., Appellants. Colleen Bennett, Defendant.
No. A14-0429.
Supreme Court of Minnesota.
Aug. 31, 2015.
Steven R. Peloquin, Peloquin Law Office, Perham, MN; and
Michael T. Feichtinger, Cally R. Kjell-berg-Nelson, Quinlivan & Hughes, P.A., Saint Cloud, MN, for respondent.
Nicholas Ostapenko, Roy J. Christensen, Michele L. Miller, Johnson, Killen & Seiler P.A., Duluth, MN, for appellants.
Charles E. Lundberg, Mark R. Bradford, Christine E. Hinrichs, Bassford Re-mete, P.A., Minneapolis, MN, for amicus curiae Minnesota Defense Lawyers Association.
Thomas D. Jensen, William L. Davidson, Lind, Jensen, Sullivan & Peterson, P.A., Minneapolis, MN, for amicus curiae Professional Liability Defense Federation.

Opinion:
OPINION
ANDERSON, Justice.
A personal representative/trustee filed a complaint alleging legal malpractice against an attorney and his law firm relating to a power of attorney drafted by the attorney's legal assistant. The district court granted the attorney's motion to dismiss, holding that the personal representative/trustee failed to provide a satisfactory expert disclosure on each element of a prima facie case of legal malpractice, in violation of Minn.Stat. § 544.42, subd. 4(a) (2014). The district court also held, applying our decision in Brown-Wilbert, Inc. v. Copeland Buhl & Co., 732 N.W.2d 209 (Minn.2007), that the disclosure was insufficient to qualify for the statute's safe-harbor protection under Minn.Stat. § 544.42, subd. 6(c) (2014). A divided court of appeals reversed and remanded, holding that expert testimony was not needed to establish but-for causation or the existence of an attorney-client relationship, and that for the two other elements for which an expert was necessary, the expert disclosure satisfied the minimum requirements of Brown-Wilbert.
Contrary to the court of appeals, we hold that the personal representative/trustee's expert disclosure on proximate cause was insufficient under BrownWWilbert. Therefore, the district court did not abuse its discretion when it dismissed the legal malpractice claim under Minn.Stat. § 544.42, subd. 6(c). We reverse.
I.
In April 2013, respondent Timothy Guz-ick, as Personal Representative of the Estate of George Nyberg and as Trustee of the George Nyberg Trust, filed a complaint against appellant Larry Kimball, an attorney, and appellant Kimball Law Office. The facts alleged in the complaint are as follows.
In 2008,- Louis Nyberg, Jr. ("Tony") asked Colleen Bennett to prepare a power of attorney form ("POA") authorizing Tony to act as attomey-in-fact for his uncle, George Nyberg ("George"). Bennett was a legal assistant for Larry Kimball, who practiced law at Kimball Law Office. Bennett printed a copy of the Minnesota Standard Short Form Power of Attorney ("Short Form") and gave it to Tony to give to George. Later, at George's house, Bennett showed George where to sign and then notarized his signature. The Short Form used by Bennett had automatically placed a checkmark on all lines, including: "This power of attorney authorizes the attorney-in-fact to transfer my property to the attorney-in-fact." The Short Form included a disclosure that it had been drafted by Kimball Law Office, and Kimball' Law Office billed George for preparing the document. Bennett never asked George if he had read the form, and never discussed with George the level of authority that George sought to grant to Tony. Kimball, Bennett's supervisor, never reviewed the POA or met with George to talk about the POA.
After George was hospitalized in early 2009, Tony went to Wells Fargo to add his name as a joint owner with a right of survivorship on two of George's accounts. Tony provided Wells Fargo with the POA, and Wells Fargo consented to Tony's request. Allegedly, George did not intend for Tony to be a joint owner of his accounts with a right of survivorship. Tony transferred money into the now-jointly owned accounts from other accounts owned by George and his trust, and in turn transferred some of those funds to accounts owned by Tony and Tony's wife. George died several days later. Both before and after George's death, Tony transferred a total of $226,524 to his and his wife's accounts.
Guzick, the personal representative of George's estate and trustee of George's trust, brought a conversion action against Tony and his wife. Tony and his wife then filed for bankruptcy. Guzick was awarded a judgment against Tony in Tony's bankruptcy proceeding. Guzick also brought an' action against Wells Fargo.
Guzick then filed suit against Kimball and Kimball Law Office (collectively "Kim- ball"). Guzick alleged a single count of legal malpractice against Kimball under two theories. Guzick first alleged that Kimball had a duty to supervise Bennett and ensure that her conduct and work product were "compatible with [Kimball's] professional obligations." Second, Guzick alleged that Kimball had a duty to meet and talk with George to assess George's need for a POA, to assess George's competency, to explain the scope of authority granted under the POA, to discuss the risks associated with that authority, and to determine whether Tony was the appropriate person to be named as George's attorney-in-fact.
As required by Minn.Stat. § 544.42, subd. 2(1) (2014), Guzick served an affidavit of expert review with the complaint. Guzick's affidavit stated that his expert had reviewed the facts alleged in the complaint, that the expert's qualifications "provide[d] a reasonable expectation that her opinions would be admissible at trial," and that the expert's opinion was that "Kimball deviated from the applicable standard of care, and by that action caused damages."
The affidavit also identified, in the expert's opinion, 10 different acts committed by Kimball that deviated from the standard of care and caused damages: (1) failure to supervise Bennett in drafting the POA; (2) failure to have in effect measures to provide reasonable assurance of the quality of Bennett's conduct and work; (3) failure to meet with George to assess his need and desire for a POA; (4) failure to meet with George to assess his ability to understand the POA; (5) failure to meet with George to ensure that he was not acting under undue influence or duress; (6) failure to explain the scope of authority provided by the POA; (7) failure to discuss the risks of granting the attorney-in-fact the broad powers in the POA; (8) failure to assess whether Tony was the appropriate individual to be named as attorney-in-fact; (9) failure to discuss with George which lines should be checked on the statutory Short Form POA; and (10) failure to send the draft of the POA to George's residence to assure that he received it unaltered.
Guzick did not provide an affidavit of expert disclosure. But in response to one of Kimball's interrogatories about expert witnesses, Guzick stated that he had regained Susan E. Johnson-Drenth as an expert, and referred Kimball to his affidavit of expert review for a summary of her opinion.
In September 2013 Kimball moved, pursuant to Minn. R, Civ. P. 56 and Minn.Stat. § 544.42 (2014), for "entry of summary judgment dismissing [Guzick's] claims." Kimball argued that Guzick failed to provide a satisfactory affidavit of expert disclosure within 180 days of commencement of the lawsuit, as required by Minn.Stat. § 544.42, subd. 2(2), and that Guzick did not qualify for subdivision 6's curative provision. Kimball argued that Guzick was required to use an expert to establish all four elements of a prima facie case of legal malpractice: the existence of an attorney-client relationship, acts constituting negligence, proximate causation, and but-for causation, see Blue Water Corp. v. O'Toole, 336 N.W.2d 279, 281 (Minn.1983), and that for each of those elements, Guzick's disclosure failed to comply with subdivision 4, which requires disclosure of "the facts and opinions to which the expert is expected to testify, and a summary of the grounds for each opinion." Minn.Stat. § 544.42, subd. 4(a).
In response, Guzick argued that his original affidavit of expert review, to which he referred in answering Kimball's interrogatories, complied with subdivision 4 for the elements actually required to be established by an expert. In the alternative, Guzick argued that his affidavit was sufficient to qualify for safe-harbor protection.
The district court granted Kimball's motion and dismissed the claim with prejudice. The district court first held that expert testimony is required to establish all four elements of Guzick's malpractice claim. The court held that Guzick's affidavit of expert review did not comply with subdivision 4 for any of the elements of the prima facie case, as Guzick's affidavit consisted of "restatements of the facts and broad, conclusory statements." The court also held that Guzick's affidavit did not qualify for subdivision 6's safe harbor because it was "grossly deficient" under Brown-Wilbert, 732 N.W.2d at 217-19.
Guzick appealed, and the court of appeals reversed and remanded. Guzick v. Kimball, No. A14-0429, 2014 WL 4957973, at *10-11 (Minn.App. Oct. 6, 2014). Guz-ick did not challenge the district court's holding that an expert was required to establish the "acts constituting negligence" element. For the remaining elements, the court of appeals held that expert opinion was required to establish the "proximate causation" element, but not the "existence of an attorney-client relationship" or "but-for causation" elements. Id, at *3-4. The court of appeals further held that, for the two elements required to be established by an expert, Guzick submitted an affidavit that was "sufficient to satisfy the minimum expert-disclosure requirements identified in Brown-Wilbert." Id. at *11.
The court of appeals' dissent concluded that an expert was required to establish but-for causation, asserting that the case did not present "one of those rare or exceptional legal-malpractice cases in which the plaintiff should be relieved of the requirement to introduce expert evidence to prove causation." Id. at *11 (Johnson, J., dissenting). The dissent also concluded that the expert disclosure on both forms of causation was not sufficient to satisfy Brown-Wilbert, asserting that the disclosure "could not possibly be any more con-clusory or any less meaningful." Id. at *13.
We granted Kimball's petition for review.
II.
Kimball asks us to reverse the court of appeals and hold that an expert was necessary to establish each element of Guzick's prima facie case, and that Guzick's disclosure failed to meet the Brown-Wilbert standard for any of the prima facie elements.
We "review a district court's dismissal of an action for procedural irregularities under an abuse of discretion standard." Brown-Wilbert, 732 N.W.2d at 215. But to the extent the dismissal involves interpreting Minn.Stat. § 544.42 (2014), we apply de novo review. Brown-Wilbert, 732 N.W.2d at 215. Further, whether expert testimony is required to establish a prima facie case is a question of law that we review de novo. See Tousignant v. St. Louis Cty., 615 N.W.2d 53, 58 (Minn.2000) (reviewing de novo such an issue in a medical malpractice case).
A prima facie case of legal malpractice requires a plaintiff to establish four things: "(1) the existence of an attorney-client relationship; (2) acts constituting negligence or breach of contract; (3) that such acts were the proximate cause of the plaintiffs damages; [and] (4) that but for defendant's conduct the plaintiff would have been successful in the prosecution or defense of the action." Blue Water Carp., Inc. v. O'Toole, 336 N.W.2d 279, 281 (Minn.1983).
If "expert testimony is to be used by a party to establish a prima facie case," a plaintiff in a professional malpractice suit must provide two affidavits. MinmStat. § 544.42, subd. 2; see also MinmStat. § 544.42, subd. 1(1) (defining a "professional" as "a licensed attorney or an architect, certified public accountant, engineer, land surveyor, or landscape architect"). The first affidavit, the expert review affidavit, generally must be served upon the defendant with the pleadings, MinmStat. § 544.42, subd. 2(1), and must contain a statement that, "in the opinion of [the] expert, the defendant deviated from the applicable standard of care and by that action caused injury to the plaintiff," Minn. Stat. § 544.42, subd. 3(a)(1). The second affidavit, the expert disclosure affidavit, must be served upon the opponent within 180 days of the commencement of discovery, Minn.Stat. § 544.42, subd. 2(2), and must:
be signed by the party's attorney and state the identity of each person whom the attorney expects to call as an expert witness at trial to testify with respect to the issues of negligence, malpractice, or causation, the substance of the facts and opinions to which the expert is expected to testify, and a summary of the grounds for each opinion. MinmStat. § 544.42, subd. 4(a). The expert disclosure affidavit requirement may also be satisfied by answers to interrogatories instead of a formal affidavit. MinmStat. § 544.42, subd. 4(a). The issue presented here is the sufficiency of the expert disclosure.
If a plaintiff fails to serve an expert disclosure affidavit or answers to interrogatories that satisfy subdivision 4(a) within 180 days, the defendant may move for mandatory dismissal "of each action with prejudice as to which expert testimony is necessary to establish a prima facie case." MinmStat. § 544.42, subd. 6(c). But the statute provides a "safe harbor" that requires the court, before granting such a motion to dismiss, to: (1) give the plaintiff notice of the deficiencies of the affidavit; and (2) give the plaintiff 60 days to cure those deficiencies. Id.
In order to give life to the second affidavit requirement, we have read a limitation into the safe-harbor provision of Minn. Stat. § 544.42, subd. 6(c). In Brown-Wilbert, Inc. v. Copeland Buhl & Co., an accounting malpractice case, we held that, to qualify for the safe harbor, a disclosure must "provide some meaningful information, beyond conclusory statements." 732 N.W.2d 209, 219 (Minn.2007). We reasoned that "an affidavit may be sufficient to satisfy the 180-day requirement even though it contains minor deficiencies," as the statute contains a "cure provision."
Id. at 217. But we also reasoned that "an affidavit is not sufficient . if the deficiencies are so great that it provides no significant information," as "[a]ny other interpretation would render the 180-day requirement meaningless." Id. at 217-18. Thus, we held that, to satisfy the 180-day requirement of section 544.42, subdivision 2(2), and qualify for safe-harbor protection under section 544.42, subdivision 6(c), an expert disclosure must meet the following "minimum standards":
(1) identiffy] each person the attorney expects to call as an expert; (2) de-scribef ] the expert's opinion on the applicable standard- of care, as recognized by the professional community; (3) ex-plaint ] the expert's opinion that the defendant departed from that standard; and (4) summarize[ ] the expert's opinion that the defendant's departure was a direct cause of the plaintiffs injuries.
Brown-Wilbert, 732 N.W.2d at 219.
The first requirement for a minimally sufficient disclosure we identified in Brown-Wilbert — identity—is satisfied here. In response to Kimball's interrogatory, which asked Guzick to "[ijdentify each expert witness whom you expect to call . as a witness at trial," Guzick answered that he had retained "Susan E. Johnson-Drenth," and referred Kimball to the affidavit of expert review filed with the complaint. This response was given less than two months after the complaint was filed, and was clearly within the 180-day limit.
The other three requirements we identified in Brown-Wilbert are the prima facie elements of an accounting malpractice case. Brown-Wilbert should not be read to require each of the latter three requirements in every professional malpractice case. See Brown-Wilbert, 732 N.W.2d at 218 (stating that "expert testimony is generally required") (emphasis added); see also Wartnick v. Moss & Barnett, 490 N.W.2d 108, 116 (Minn.1992) (stating that, for the element of breach of duty, expert testimony is "[generally" required, "unless the conduct can be evaluated by a jury in the absence of expert' testimony"). Indeed, the statute requires that in a professional malpractice action "where expert testimony is to be used by a party to establish a prima facie case," Minn.Stat. § 544.42, subd. 2 (emphasis added), the party must submit an expert disclosure affidavit with respect to the "issues of negligence, malpractice, or causation." Minn.Stat. § 544.42, subd. 4(a) (emphasis added). Thus, whether a plaintiff is required to make an expert disclosure is something that must be determined on a case-by-case basis for each element of the prima facie case of malpractice. If expert disclosure is required for a particular element, we must then determine whether the party's disclosure for that element satisfied the "meaningful disclosure" requirement of Browwr-Wilbert.
We have discussed whether expert testimony is required for the elements of a legal malpractice case on only a few occasions. The issue first appeared in Hill v. Okay Construction Co., 312 Minn. 324, 336-36, 252 N.W.2d 107, 116 (1977). Borrowing from medical malpractice precedent, we articulated the general rule that the "duty" and "breach" elements of attorney malpractice, also known as "acts constituting negligence," must be established by expert testimony:
Expert testimony should be generally required to establish the standard of care applicable to an attorney whose conduct is alleged to have been negligent and further to establish that his conduct deviated from that standard. That general rule should be subject to the exception that such expert testimony is not necessary in cases where the conduct complained of can.be evaluated adequately by a jury in the absence of expert testimony.
Id. at 337, 252 N.W.2d at 116. We held that the act constituting negligence in the case — the approval of financial profiles— was an exception and did not need to be established by expert opinion. Id. at 337-38, 252 N.W.2d at 116-17.
In Wartnick v. Moss & Barnett, we reiterated the holding of Hill and stated that expert testimony is generally required to establish both the applicable standard of care and breach of that standard, "unless the conduct can be evaluated by a jury in the absence of expert testimony." 490 N.W.2d 108, 116 (Minn.1992). Similarly, in Admiral Merchants Motor Freight, Inc. v. O'Connor & Hannan, we stated that "[e]x-pert testimony generally is required to establish a standard of care applicable to an attorney whose conduct is alleged to have been negligent, and further to establish whether the conduct deviated from that standard." 494 N.W.2d 261, 266 (Minn.1992). We, in turn, quoted Admiral Merchants in Jerry's Enterprises, Inc. v. Larkin, Hoffman, Daly & Lindgren, Ltd. to "generally require[ ]" expert testimony regarding duty and breach of duty. 711 N.W.2d 811, 817 (Minn.2006).
We have never required expert testimony on the other elements of a prima facie ease of legal malpractice. Broum-Wilbert, an accounting malpractice case, credited Admiral Merchants, a legal malpractice case, as "stating that expert testimony is generally required to establish the standard of care applicable to legal malpractice, whether the attorney deviated from that standard, and whether that deviation caused the plaintiff's injury." Brown-Wilbert, 732 N.W.2d at 218 (emphasis added). But in Admiral Merchants we only stated that "[ejxpert testimony generally is required to establish a standard of care applicable to an attorney whose conduct is alleged to have been negligent, and further to establish whether .the conduct deviated from that standard." 494 N.W.2d at 266 (citing Hill, 312 Minn, at 337, 252 N.W.2d at 116). In fact, in that case the plaintiff, Admiral Merchants, presented expert testimony "that the alleged failure to request arbitration was negligent," not that the negligent act caused the injury. Id. Even in the absence of expert testimony on causation, we concluded a genuine issue of material fact existed and reversed the district court's grant of summary judgment in favor of the law firm. Id. at 267.
Here, the parties do not dispute that an expert was required to establish the acts constituting negligence and proximate causation elements, but dispute whether an expert was required on the but-for causation and existence of an attorney-client relationship elements. The parties further dispute whether Guzick made an expert disclosure that satisfied Brown-Wilbert's standard for but-for causation, proximate causation, and the existence of an attorney-client relationship.
III.
We first consider but-for causation. Kimball argues that the court of appeals "unilaterally rewrote malpractice law" when it concluded that expert testimony was not required to establish but-for causation, as this is not a "rare" exempt case. Kimball argues that it would not be within the competence of a jury — absent expert testimony — to determine whether George would have signed the POA but for Kim-ball's alleged negligent acts. Guzick responds that but-for causation is not even necessary in this case, as it does not involve damage to or loss of a cause of action.
Guzick's claim that he need not establish but-for causation is wrong. When a case does not involve damage to or loss of a cause of action, but instead involves transactional malpractice, we have modified the but-for element to require a plaintiff to show that, "but for defendant's conduct, the plaintiff would have obtained a more favorable result in the underlying transaction than the result obtained." Jerry's Enters., 711 N.W.2d at 819.
On the other hand, Kimball and the court of appeals are mistaken when they claim that, for but-for causation in a legal malpractice case, "[o]nly the 'rare' or 'exceptional' case is capable of resolution without expert testimony." Guzick, 2014 WL 4957973 at *3. We have never addressed the need for expert testimony on but-for causation in a legal malpractice claim. The case cited by the court of appeals for that proposition, Fontaine v. Steen, 759 N.W.2d 672, 677 (Minn.App.2009), relied on Sorenson v. St. Paul Ramsey Medical Center, 457 N.W.2d 188, 191 (Minn.1990).- Sorenson is a medical malpractice case, meaning it has limited applicability to a legal malpractice case. See Tousignant v. St. Louis Cty., 615 N.W.2d 53, 58 (Minn.2000) (stating that the requirement of expert testimony to establish medical malpractice and causation "is based on the assumption that most medical malpractice cases involve complex issues of science or technology, requiring expert testimony to assist the jury in determining liability"). Although legal malpractice claims may involve complex causation issues, "complex issues of science or technology" are generally not found in legal malpractice cases.
Instead of relying on a general rule, we analyze whether the facts needed to establish but-for causation are within an area of common knowledge and lay comprehension such that they can be adequately evaluated by a jury in the absence of an expert. Hill, 312 Minn, at 337, 252 N.W.2d at 116. With this standard in mind, there are two prominent links in the chain of causation here. The first is whether, but for Kim-ball's negligent acts, the POA would not have been overbroad. The second is whether, but for the overbroad POA, George's funds would not have been converted.
To find but-for causation for the first causal link a jury would need to determine whether, but for Kimball's failure to supervise Bennett and meet with George, the POA, would not have been overbroad. This chain of evidence could be adequately evaluated by a jury in the absence of expert testimony. To determine what George wanted or would have wanted after receiving competent legal counsel, the jury could examine his estate planning documents and any contemporaneous communications he made to Bennett or others regarding his intentions with the POA.
To find but-for causation for the second causal link the jury would need to determine whether, but for the overbroad POA, Tony would not have converted George's funds. This could be answered by the POA itself (whether the POA gave Tony the ability to transfer funds), and by Tony and Wells Fargo concerning Tony's conversion (whether Tony relied on the POA to transfer funds). None of this information is so complex that it requires an expert to explain it. Thus, Guzick was not required to make an expert disclosure on but-for causation.
IV.
Kimball agrees with the court of appeals that an expert was required to establish proximate causation, and Guzick does not dispute this. Thus, because an expert was required to establish proximate cause, we must determine whether Guz-ick's expert disclosure satisfied Brown-Wilbert to qualify for safe-harbor protection. The court of appeals held that it did. "By identifying the standard of care, the manner in which respondents breached that standard, and the injuries suffered by appellant, the affidavit necessarily implies that the injuries arising from the breaches were foreseeable." Guzick, 2014 WL 4957973, at *10.
We disagree. Although the affidavit read as a whole may very well imply that Kimball's actions were the proximate cause of Guzick's injuries, it is not enough to satisfy Bronmr-Wilbert, which requires an affidavit to provide meaningful information that "summarizes the expert's opinion." 732 N.W.2d at 219. A summary requires more than an implication; rather, a sufficient summary explicitly explains the expert's opinion on how the negligent acts were the proximate cause of the injury. Here, the affidavit does not at all detail the expert's theory of causation. It only states that Kimball's negligent acts "caused damages." This is exactly the type of conclusory statement we disapproved in Brown-Wilbert, 732 N.W.2d at 219 (stating that an affidavit must "provide some meaningful information, beyond con-clusory statements, that . summarizes the expert's opinion that the defendant's departure was a direct cause of the plaintiffs injuries" (emphasis added)).
This is not a minor defect. When he commenced this action, Guzick was not just beginning to explore the issues of liability and causation; he had previously brought actions against not one but two parties. Guzick had knowledge of the facts, and had been pursuing claims, for multiple years. To allow him to use the safe harbor, in light of these circumstances and given the conclusory statements we previously disapproved of in Brown-Wilbert, would eviscerate the second affidavit requirement.
Thus, Guzick's expert disclosure contains a major defect; it lacks a meaningful disclosure of an expert's opinion on an element of the prima facie case required to be established by an expert. Pursuant to Brown-Wilbert, such an expert disclosure does not qualify for safe-harbor protection to cure the defect. Because the disclosure's major defect precludes the use of the safe harbor of MinmStat. § 544.42, subd. 6(c), the district court did not abuse its discretion in dismissing the complaint with prejudice.
Reversed.
. Guzick later amended the complaint to include two more defendants: Kimball's previous law firm, Kimball and Undem, and the legal assistant, Bennett. Guzick alleged the same legal malpractice claim against Kimball and Undem as he had alleged against Kimball and Kimball Law. As for Bennett, Guzick alleged one count of negligence relating to the preparation of the POA. Bennett later successfully moved for summary judgment, an issue not before us.
. Although the parties, the district court, and the court of appeals labeled the motion as one for summary judgment, it is more accurately described as a motion for "statutory dismissal for procedural reasons.'' See Sorenson v. St. Paul Ramsey Med. Ctr., 457 N.W.2d 188, 189 n. 1 (Minn. 1990).
. The statute has been amended since the disclosure affidavit was served in this case, to require such an affidavit to be served within 180 days of commencement of discovery. See Act of April 3, 2014, ch. 153, § 3, 2014 Minn. Laws 110, 111 (codified as amended at Minn. Stat. § 544.42, subd. 2(2) (2014)). This amendment does not affect the analysis of this case.
. Kimball argues that Guzick's expert review affidavit cannot also serve as the expert disclosure affidavit. It is at least conceivable that a carefully drawn and detailed expert review affidavit could also qualify as an expert disclosure affidavit. We need not, and do not, decide that issue here.
. Kimball argues that expert testimony is always required to establish the existence of an attorney-client relationship when the evidence of the relationship is disputed. We have never held that expert testimony is necessarily required to establish the existence of an attorney-client relationship. It is, of course, conceivable that expert disclosure may be necessary on this first element of a legal malpractice claim. See Minn.Stat. § 544.42, subd. 6(c) (stating that a motion to dismiss may be granted only with respect to each action "as to which expert testimony is necessary to establish a prima facie case"). But it is also possible to posit circumstances that establish sufficient evidence of an attorney-client relationship without resorting to expert witness testimony. But because we conclude that Guzick's disclosure was insufficient as to proximate cause, we need not, and do not, decide whether an expert was required to establish the existence of an attorney-client relationship in this case.
. In reaching the but-for causation issue, Guzick's expert would already have established a standard of care that Kimball should have followed in giving George legal advice.