Document:

Exhibit 10.13

 Exhibit 10.13 
 Dear: 
 As you are aware, your employment with Great Wolf Resorts, Inc., a Delaware corporation or
its indirect subsidiary, Great Lakes Services, LLC, a Delaware limited liability company (collectively, “GWR”) is subject to the personnel policies and procedures that apply to GWR’s to GWR’s corporate employees in general. Such
policies and procedures may be adopted, revised or deleted from time to time by GWR, at its sole discretion. Your employment with GWR is on an “at will” basis, such that either you or GWR may terminate the employment relationship at any
time with or without notice and with or without Cause (as defined below). 
 Without limiting the generality of the foregoing, the purpose of
this letter of agreement (“Agreement”) is to set forth the terms and conditions pursuant to which you will be eligible to receive a severance payment from GWR in the event of termination of your employment by GWR without Cause following a
Change of Control (as defined below). 
  

	I.	For purposes of this Agreement: 

  

	 	1.	The term “Change of Control” shall mean any one or more of the following: 

 

	 	(a)	The sale, lease, transfer, conveyance or other disposition, in one transaction or a series of related transactions, of all or substantially all of the assets of GWR
other than to an affiliate of GWR; 

  

	 	(b)	The sale, transfer, exchange or other disposition, in a single transaction or in multiple related transactions, by one or more shareholders of GWR of more than fifty
percent (50%), in the aggregate, of the outstanding voting securities of GWR if the holders of such voting securities prior to such transaction(s) do not own, in the aggregate, more than fifty percent (50%) of the outstanding voting securities
of GWR following such transaction(s); and/or 

  

	 	(c)	Over a period of two years or less, individuals who constitute the Board of Directors of GWR (including those individuals who were elected to serve but have not taken
office) cease for any reason to constitute at least a majority of the Board of Directors of GWR. 

  

	 	2.	The term “Cause” shall mean: 

	 	(a)	You are convicted of, plead guilty to or confess or otherwise admit to any felony or any act of theft, bribery, fraud, misappropriation, embezzlement or similar act of
dishonesty; 

  

	 	(b)	There is any act or omission by you involving malfeasance or gross negligence in the performance of your duties and responsibilities at GWR to the material detriment of
GWR; 

  

	 	(c)	You violate any provision of any code of conduct adopted by GWR, or any other GWR written policy, that applies to you and any other GWR employees if the consequence of
such violation by any person subject to such code of conduct ordinarily would be a termination of his or her employment by GWR; or 

  

	 	(d)	You fail to comply with the reasonable instructions of your supervisor on more than one occasion, to the material detriment of GWR. 

 

	 	3.	The term “Disability” shall mean any physical or mental condition which renders you unable, even with reasonable accommodation by GWR, to perform the
essential functions of your job for a period of at least one hundred eighty (180) consecutive days and which renders you eligible to receive benefits under GWR’s long-term disability plan as of the date that your employment terminates.

  

	II.	Severance Payment 

In consideration of your acknowledgments and agreements as set forth in this Agreement, if, at any time within twelve (12) months
following a Change of Control, GWR terminates your employment without Cause, GWR shall pay to you an amount equal to twelve (12) months of your then-current annual base salary, less normal payroll withholdings for income and employment taxes
(“Severance Payment”). The Severance Payment shall be payable in one lump sum within thirty (30) days of the effective date of the termination of your employment with GWR. Notwithstanding the foregoing, in no event shall the Severance
Payment be due if GWR terminates your employment for Cause or as the result of your death or Disability. Except as expressly provided in this Agreement or as required by law, you shall not be entitled to receive, and GWR shall not be obligated to
make, any other payments in connection with the termination of your employment with GWR. 
  

	III.	Non-Competition, Non-Solicitation and Non-Disclosure 

 You acknowledge that (a) GWR is engaged in the business of planning, developing and operating family resorts featuring indoor waterparks and other entertainment amenities (“Business”),
(b) GWR’s Business and services are highly specialized, (c) the identity and particular needs of GWR’s customers and suppliers are not generally known, (d) the documents and information regarding GWR’s customers,
suppliers, services, methods of operation, sales, pricing and costs are highly confidential and, in some instances, constitute Trade Secrets (as defined below), (e) the services rendered by you to GWR have been or will be of a special and
unusual character which have a unique value to GWR, and (f) you have had or will have access to Trade Secrets and Confidential Information (as defined below), the loss of which cannot be adequately compensated by

 
damages in an action at law. In light of the foregoing acknowledgments and in consideration of the Severance Payment, you agree as follows: 

 

	 	1.	Except as may be required in the performance of your professional duties for GWR, you shall not use or disclose, directly or indirectly, any Trade Secrets or
Confidential Information during your employment with GWR and thereafter to the extent any such Trade Secret or Confidential Information is not generally known to the public through no fault of you or others similarly obligated to maintain the
confidentiality thereof. The foregoing obligation shall not prohibit your use of general skills and know-how acquired during and prior to your employment by GWR, so long as such use does not involve the use or disclosure of Confidential Information
or Trade Secrets. 

 For purposes of this Agreement: 

 

	 	(a)	The term “Trade Secret” shall mean all information possessed by or developed for GWR, including, without limitation, a compilation, program, device, method,
system, technique or process, of which all of the following apply: (i) the information derives independent economic value, actual or potential, from not being generally known to, and not being readily ascertainable through proper means by,
other persons who can obtain economic value from its disclosure or use; and (ii) the information is the subject of efforts to maintain its secrecy that are reasonable under the circumstances. 

 

	 	(b)	“Confidential Information” means information, to the extent it is not a Trade Secret, which is possessed by or developed for GWR, including by you, and which
relates to GWR’s existing or potential business or technology, which information is not generally known to the public and which information GWR seeks to protect from disclosure to its existing or potential competitors or others, including,
without limitation, business plans, contemplated future locations and development plans, strategies, existing or proposed bids, costs, technical developments, existing or proposed research projects, financial or business projections, investments,
marketing plans, negotiation strategies, training information and materials, customer lists, information generated for customer engagements and information stored or developed for use in or with computers. Confidential Information also includes
information received by GWR from others which GWR has an obligation to treat as confidential and to adhere to specified restrictions on the use thereof, including all information obtained in connection with customer engagements. Confidential
Information does not include information you rightfully possessed and knew before your association with GWR, information that becomes generally known to the public domain through no fault of you or others similarly obligated to maintain the
confidentiality thereof, and information unrelated to the Business that you independently develop without access to or use of Trade Secrets or Confidential Information. 

During your employment by GWR, you shall do what is reasonably necessary to prevent the unauthorized use, misappropriation or disclosure,
and the threatened 

 
unauthorized use, misappropriation or disclosure, of Trade Secrets and Confidential Information. 
 Immediately upon the termination of your employment with GWR for any reason, or at any other time upon the request of GWR, you shall promptly deliver to GWR, and not retain any electronic, paper or other
copies of, all documents and other materials in your possession which contain Confidential Information or Trade Secrets in whatever form, media, format or context. 
  

	 	2.	During the term of your employment with GWR and for a period of twelve (12) months following the voluntary or involuntary termination of your employment with GWR
for any reason, you shall not, directly or indirectly, as an individual or as a partner, member, manager, director, owner, employee, agent, advisor, consultant, independent contractor or otherwise, (a) solicit or induce any employee of GWR to
leave his or her employment with GWR, (b) solicit or induce any independent contractor of GWR to terminate his/her or its relationship with GWR, (c) interfere with any person’s or entity’s relationship with GWR as an employee or
independent contractor, or (d) induce or attempt to induce any person or entity to breach his or her employment agreement or independent contractor agreement with GWR. The foregoing obligation shall not prohibit you, as an individual or as a
partner, member, manager, director, owner, employee, agent, advisor, consultant or otherwise, from hiring or engaging any employee or independent contractor of GWR who voluntarily seeks such employment or engagement without solicitation or
inducement by you. 

  

	 	3.	During the term of your employment with GWR and for a period of twelve (12) months following the voluntary or involuntary termination of your employment with GWR
for any reason, you shall not, directly or indirectly, as an individual or as a partner, member, manager, director, owner, employee, agent, advisor, consultant, independent contractor or otherwise, divert, induce or attempt to divert or induce, or
assist any other person to divert, induce or attempt to divert or induce, any customer or supplier of GWR with which you had material business contact during your employment with GWR, to reduce or discontinue its relationship with GWR or any of its
affiliates. 

  

	 	4.	During the term of your employment with GWR and for a period of twelve (12) months following the voluntary or involuntary termination of your employment with GWR
for any reason, you shall not (a) serve as a partner, employee, consultant, independent contractor, officer, director, member, manager, agent, associate or otherwise for the owner, developer or operator of, or (b) whether directly or
indirectly, finance, acquire any interest in, own, lease, operate, manage, invest in, design, develop, manage, organize or otherwise affiliate yourself with, any hotel, condominium, timeshare facility or other residential or transient residential
facility which features indoor water amenities in excess of 10,000 square feet in the aggregate and which is located within fifty (50) miles of any resort owned, managed, operated or under development or pre-development, or is being
contemplated or evaluated for development by GWR as of the date of the termination of your employment with GWR. 

 In addition to all of the remedies otherwise available to GWR, including, but not limited
to, recovery from you of the Severance Payment, damages and reasonable attorneys’ fees incurred in the enforcement of this Agreement, GWR shall have the right to injunctive relief to restrain and enjoin any actual or threatened breach of the
provisions of the “Non-Competition, Non-Solicitation and Non-Disclosure” section of this Agreement. All of GWR’s remedies for breach of this Agreement shall be cumulative and the pursuit of one remedy shall not be deemed to exclude
any other remedies available pursuant to this Agreement, at law or in equity. 
 You acknowledge that you have carefully read
and considered the provisions hereof and, having done so, after having consulted with legal counsel at your discretion, you (a) agree that the restrictions set forth in the “Non-Competition, Non-Solicitation and Non-Disclosure”
section of this Agreement (including, but not limited to, the time periods of restriction therein) are (i) fair and reasonable in light of the scope of the business conducted by GWR, and (ii) reasonably required for the protection of the
legitimate and essential interests of GWR in, among other things, its customer and supplier relationships, its employment relationships, its Business, its good will, Confidential Information and Trade Secrets, and (b) recognize (i) the
narrow range of activities prohibited, (ii) the national market in which GWR operates, and (iii) the limited geographic territories and time periods in which such restrictions apply. 

 

	IV.	Choice of Forum and Governing Law 

 You and GWR acknowledge and recognize the substantial contacts that you and GWR have and will continue to have with the State of Delaware, the need for all executives eligible for the Severance Payment to
be treated equally regardless of the location where they perform their employment duties, and the parties’ expectations under this Agreement are that Delaware law will apply. Accordingly, you and GWR agree that (a) any litigation involving
any actual or threatened noncompliance with or breach of this Agreement, or regarding the interpretation, validity and/or enforceability of this Agreement, shall be filed and conducted exclusively in the State of Delaware, and (b) this
Agreement shall be interpreted in accordance with and governed by the laws of the State of Delaware, without regard for any conflict of law principles. You consent to the jurisdiction of the courts within Delaware and to the prompt dismissal of any
action related to this Agreement or its subject matter initiated by you in any other jurisdiction. 
  

	V.	Severability 

 Each
provision of this Agreement shall be considered severable and if, for any reason, any provision or provisions of this Agreement, or the application of such provision to any party or circumstance, shall be held invalid or unenforceable in any
jurisdiction, such provision or provisions shall, as to such jurisdiction, be ineffective to the extent of such invalidity or unenforceability without invalidating the remaining provisions hereof, or the application of the affected provisions to
parties or circumstances other than those to which it was held invalid or unenforceable, and any such invalidity or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

 To the extent that any provision of this Agreement is held to be invalid or unenforceable because it is overbroad, to the
extent allowed by law that 

 
provision shall not be void but rather shall be limited only to the extent required by applicable law and enforced as so limited. 

 

	V.	Release 

 As a
further condition to your receipt of the Severance Payment, you shall execute, effective as of the date of termination of your employment with GWR, a release in such form as is acceptable to GWR and you. 

Please indicate your acknowledgment and acceptance of the terms and conditions of this Agreement by executing a copy of this Agreement and returning it
to me. 
 Sincerely, 
 Chief Executive
Officer 
 Agreed to and accepted as of the          day of
                 20:SEVERANCE AND RELEASE AGREEMENT

 Exhibit 10.1 
 SEATTLE GENETICS, INC. 
 SEVERANCE AND RELEASE AGREEMENT

 This Severance and Release Agreement (the “Agreement”) is entered into as of February 23, 2012
(the “Effective Date”) by and between Seattle Genetics, Inc. (the “Company”) and Bruce J. Seeley (“Employee”). 
 WHEREAS, Employee has been employed as the Company’s Executive Vice President, Commercial; 
 WHEREAS, the Company and Employee have mutually agreed to terminate Employee’s employment relationship on the terms set forth below; 

NOW, THEREFORE, in consideration of the mutual promises made herein, the receipt and sufficiency of which are hereby acknowledged by the
Company and Employee, both of them hereby agree as follows: 
 1. Termination of Employment. The effective date of
the termination of Employee’s employment with the Company shall be March 1, 2012 (the “Termination Date”). Employee shall, until otherwise directed by the Company, continue to perform his regular job duties and
responsibilities for the Company through the Termination Date and shall continue to comply with all Company policies and procedures. The Company shall pay to Employee his salary and accrued but unused vacation through the Termination Date. In
addition, the Company shall provide all benefits due to Employee with respect to his employment through the Termination Date. 

2. Consideration. In consideration for the release of claims set forth in Section 4 below and other obligations under
this Agreement, and provided that Employee does not revoke his execution of this Agreement during the Revocation Period described in Section 5 below, the Company agrees to provide to Employee the following benefits following the Termination
Date: 
 (a) payment of a single lump sum gross severance amount, subject to withholding of applicable taxes, which is equal to
twelve (12) months of Employee’s regular base salary; 
 (b) payment of a single lump sum gross severance amount,
subject to withholding of applicable taxes, which is equal to a pro-rated bonus of two (2) months using an earned rate of one hundred percent (100%) for individual and Company performance at the forty percent (40%) threshold for the
Executive Vice President position; 
 (c) continued health insurance benefits through COBRA payments from the Termination Date
through March 1, 2013 provided that Employee properly and timely elects such coverage as provided for in the Company’s COBRA notice materials; 
 (d) Employee’s options for the Company’s common stock and restricted stock units outstanding and unvested as of the Termination Date shall accelerate in vesting for a period equal to twelve
(12) months in accordance with the terms of the Company’s 2007 Equity Incentive Plan and Employee’s stock option agreements, including the provision that any outstanding vested options must be exercised within ninety (90) days of
the Termination Date or such options shall be terminated; and 
 (e) provision of reasonable career outplacement services as
part of Career Transition Services provided by Lee Hecht Harrison for up to six (6) months. 

 3. Property Return. Prior to the Termination Date, Employee agrees to return
to the Company all Company-owned property in Employee’s possession, such as all keys to Company buildings or property, all Company-owned equipment, including laptops and cellular phones, all Company software, documents and papers (such as
reports, presentations, notebooks, and files), all Company credit cards, and all other Company property. Employee agrees to destroy personal copies of such property and shall not use or transfer any Company property to others. 

4. Release of Claims. In exchange for the consideration provided under this Agreement, Employee and his successors and
assigns hereby fully and forever release and discharge the Company, any of its subsidiaries, affiliated or related companies, any Company-sponsored employee benefit plan in which Employee participates and any of its or their respective officers,
directors, trustees, fiduciaries, stockholders, agents, employees, investors, stockholders, administrators, and their successors and assigns from any claim, duty, obligation or cause of action relating to any matters of any kind, whether known or
unknown, suspected or unsuspected, that Employee may possess arising from any omissions, acts or facts that have occurred up until and including the date of this Agreement, including, without limitation: 

(a) any and all claims relating to or arising from Employee’s employment relationship with the Company and termination of that
relationship; 
 (b) any and all claims relating to, or arising from, Employee’s right to purchase, or actual purchase of
shares of stock of the Company; 
 (c) any and all claims for personal injury, wrongful discharge of employment, breach of
contract (both express and implied), breach of a covenant of good faith and fair dealing (both express and implied), negligent or intentional infliction of emotional distress, negligent or intentional misrepresentation, negligent or intentional
interference with contract or prospective economic advantage and defamation; 
 (d) any and all claims for violation of any
federal, state or local statute, including, but not limited to the Title VII of the Civil Rights Act of 1964, the Civil Rights Act of 1991, the Age Discrimination in Employment Act, the Older Workers’ Benefits Protection Act, The Americans With
Disabilities Act, the Employee Retirement Income Security Act, the Workers Retraining and Notification Act, the Fair Labor Standards Act, the Washington Law Against Discrimination and the Washington Minimum Wage Act; 

(e) any and all claims arising out of any other state, federal or local laws and regulations relating to employment, the payment of wages
or employment discrimination; and 
 (f) any and all claims for attorney’s fees and costs. 

Employee and the Company agree that the release set forth in this Section 4 shall be and shall remain in effect as a complete
general release as to the matters released. This release does not extend to any obligations incurred under this Agreement or to any rights or claims that may arise after the Effective Date. 

5. Acknowledgement of Wavier of Claims under ADEA. Employee acknowledges that he is waiving and releasing any rights he may
have under the Age Discrimination in Employment Act of 1967 (“ADEA”) and that this waiver and release is knowing and voluntary. Employee and the Company agree that this waiver and release does not apply to any rights or claims that
may arise under the ADEA after the Effective Date. Employee acknowledges that the consideration given for this Agreement is in addition to anything of value to which Employee was already entitled. Employee further acknowledges

  
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that he has been advised by this writing that: (a) he should consult with and obtain the advice of an attorney of his choice prior to executing this Agreement; (b) he has
twenty-one (21) days in which to consider this Agreement; (c) he has seven (7) days following executing this Agreement to revoke this Agreement (the “Revocation Period”); and (d) this Agreement shall not be
effective until the Revocation Period has expired. Any revocation should be in writing and delivered to Chris Pawlowicz at the Company at the following address: Seattle Genetics, Inc., 21823 - 30th Drive S.E., Bothell, WA 98021 by close of business
on the seventh (7th) day from the date that Employee signs
this Agreement. Unless revoked in accordance with this Section 5, the Agreement will become final and irrevocable on the eighth (8th) day following execution of this Agreement.

 6. Confidentiality Agreement. Employee represents and warrants that he has not breached his obligations
to the Company under the terms of the Proprietary Information and Inventions Agreement previously entered into between Employee and the Company (the “Proprietary Agreement”). Employee shall continue to maintain the confidentiality
of all confidential and proprietary information of the Company as provided by the Proprietary Agreement, including the terms of this Agreement, which agreement shall remain in effect pursuant to its terms. In the future, Employee agrees to take any
actions and to execute any documents reasonably required to assign inventions or patent applications that are owned by the Company on which he is an inventor to the Company pursuant to the terms of the Proprietary Agreement. 

7. Miscellaneous. 
 (a) Amendments and Waivers. Any term of this Agreement may be amended or waived only with the written consent of the parties. 

(b) Sole Agreement. This Agreement constitutes the sole agreement of the parties and supersedes all oral negotiations and
prior writings with respect to the subject matter hereof, but excluding any existing stock option agreements and the Proprietary Agreement. 
 (c) Notices. Any notice required or permitted by this Agreement shall be in writing and shall be deemed sufficient upon receipt, when delivered personally or by courier, overnight delivery
service or confirmed facsimile, or forty-eight (48) hours after being deposited in the regular mail as certified or registered mail (airmail if sent internationally) with postage prepaid, if such notice is addressed to the party to be notified
at such party’s address or facsimile number as set forth below, or as subsequently modified by written notice. 
 (d)
Choice of Law, Arbitration. The validity, interpretation, construction and performance of this Agreement shall be governed by the laws of the State of Washington, without giving effect to the principles of conflict of laws. Any
controversy regarding this Agreement or the breach thereof shall be resolved exclusively by arbitration in King County, Washington. Arbitration shall be conducted in accordance with the then-prevailing arbitration rules of Judicial Dispute
Resolution (“JDR”), with one arbitrator appointed by the mutual consent of the parties or, in the absence of such consent, by application of any party to JDR. The parties agree to abide by all decisions and awards rendered in such
proceedings. Such decisions and awards rendered by the arbitrator shall be final and conclusive and may be entered in any court having jurisdiction thereof as a basis of judgment and of the issuance of execution for its collection. All
such controversies, claims or disputes shall be settled in this manner in lieu of any action at law or equity; provided, however, that nothing in this section shall be construed as precluding the Company from bringing an action for injunctive relief
or other equitable relief. 
 (e) Severability. In the event that any provision hereof becomes or is declared by a
court of competent jurisdiction to be illegal, unenforceable or void, said provision may be modified by the court to the extent necessary to render it enforceable and the remainder of this Agreement shall continue in full force and effect.

  
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 (f) Effective Date. This Agreement is effective after it has been signed by
both parties and when eight (8) days have passed since Employee has signed the Agreement, unless revoked by Employee within seven (7) days after the date the Agreement was signed by Employee. 

(g) Counterparts. This Agreement may be executed in counterparts, and each counterpart shall have the same force and effect
as an original and shall constitute an effective, binding agreement on the part of each of the undersigned. 
 (h)
Voluntary Execution of Agreement. This Agreement is executed voluntarily and without any duress or undue influence on the part or behalf of the parties hereto. The parties acknowledge that: 

They have read this Agreement; 
 They have been represented in the preparation, negotiation, and execution of this Agreement by legal counsel of their own choice or that they have voluntarily declined to seek such counsel; 

They understand the terms and consequences of this Agreement and of the releases it contains, and 

They are fully aware of the legal and binding effect of this Agreement. 

Employee acknowledges and agrees that he has been given at least twenty-one (21) days to decide whether to sign this Agreement, and
has signed it only after full reflection and analysis. Employee further acknowledges that Employee has been encouraged to obtain an attorney’s independent counsel and advice, and that Employee has read and understands the complete Agreement. By
signing this Agreement prior to the expiration of the twenty-one (21) day period set forth in Section 5 herein, Employee acknowledges and agrees that he had adequate time and opportunity to fully consider his rights and this release of
them. 
 [Signature Page Follows] 

  
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 The parties have executed this Agreement on the respective dates set forth below.

  

					
	COMPANY:
	
	SEATTLE GENETICS, INC.
		
	By:	 	 /s/ Clay B. Siegall

		
	Its:	 	President and CEO

 
			
		
	Address:	 	21823 30th Drive SE
		 	Bothell, WA 98021
	
	Date:  2/21/2012
		 	
	EMPLOYEE:
	
	Bruce J. Seeley
	
	 /s/ Bruce J. Seeley

	Signature	 	
		 	
	Address:	 	
	
	Date:  2/23/2012

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