EXHIBIT 10.4




                                                     November 11, 2004


Ardent Acquisition Corporation
1415 Kellum Place, Suite 205
Garden City, New York 11530

EarlyBirdCapital, Inc.
600 Third Avenue
33rd Floor
New York, New York 10016

                  Re:      INITIAL PUBLIC OFFERING

Gentlemen:

                  The undersigned stockholder and director of Ardent Acquisition
Corporation  ("Company"),  in  consideration of  EarlyBirdCapital,  Inc. ("EBC")
entering  into a letter of intent  ("Letter of Intent") to underwrite an initial
public  offering of the  securities of the Company  ("IPO") and embarking on the
IPO process, hereby agrees as follows (certain capitalized terms used herein are
defined in paragraph 11 hereof):

                  1. If the Company  solicits  approval of its stockholders of a
Business Combination,  the undersigned will vote all Insider Shares owned by him
in  accordance  with the  majority  of the votes cast by the  holders of the IPO
Shares.

                  2. In the  event  that  the  Company  fails  to  consummate  a
Business Combination within 18 months from the effective date ("Effective Date")
of the  registration  statement  relating  to the IPO (or 24  months  under  the
circumstances  described in the prospectus relating to the IPO), the undersigned
will take all  reasonable  actions  within  his power to cause  the  Company  to
liquidate as soon as reasonably  practicable.  The undersigned hereby waives any
and all right, title, interest or claim of any kind in or to any distribution of
the  Trust  Fund (as  defined  in the  Letter  of  Intent)  as a result  of such
liquidation  with respect to his Insider Shares  ("Claim") and hereby waives any
Claim the  undersigned may have in the future as a result of, or arising out of,
any contracts or agreements with the Company and will not seek recourse  against
the Trust Fund for any reason  whatsoever.  The undersigned  agrees to indemnify
and hold harmless


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Ardent Acquisition Corporation
EarlyBirdCapital, Inc.
November 11, 2004
Page 2




the Company, pro rata with the other officers and directors of the Company based
on the number of Insider  Shares held by each such  individual,  against any and
all loss, liability,  claims, damage and expense whatsoever (including,  but not
limited  to,  any and  all  legal  or  other  expenses  reasonably  incurred  in
investigating, preparing or defending against any litigation, whether pending or
threatened,  or any claim  whatsoever) which the Company may become subject as a
result  of any  claim by any  vendor or other  person  who is owed  money by the
Company for services  rendered or products sold, or by any target business,  but
only to the extent necessary to ensure that such loss, liability,  claim, damage
or expense does not reduce the amount in the Trust Fund.

                  3. In order to minimize potential  conflicts of interest which
may arise from multiple  affiliations,  the undersigned agrees to present to the
Company for its  consideration,  prior to  presentation  to any other  person or
entity,  any suitable  opportunity to acquire an operating  business,  until the
earlier  of the  consummation  by the  Company of a  Business  Combination,  the
liquidation of the Company or until such time as the undersigned ceases to be an
officer  or  director  of the  Company,  subject to any  pre-existing  fiduciary
obligations the undersigned might have.

                  4. The  undersigned  acknowledges  and agrees that the Company
will not consummate any Business  Combination  which involves a company which is
affiliated  with any of the Insiders  unless the Company obtains an opinion from
an independent  investment  banking firm  reasonably  acceptable to EBC that the
business  combination  is fair to the  Company's  stockholders  from a financial
perspective.

                  5.  Neither the  undersigned,  any member of the family of the
undersigned,  nor any Affiliate of the  undersigned  will be entitled to receive
and will not accept any compensation for services  rendered to the Company prior
to the consummation of the Business  Combination;  provided that the undersigned
shall be entitled  to  reimbursement  from the  Company for their  out-of-pocket
expenses  incurred  in  connection  with  seeking  and  consummating  a Business
Combination.

                  6.  Neither the  undersigned,  any member of the family of the
undersigned,  or any Affiliate of the undersigned will be entitled to receive or
accept a finder's fee or any other  compensation  in the event the  undersigned,
any member of the family of the  undersigned or any Affiliate of the undersigned
originates a Business Combination.

                  7. The  undersigned  will  escrow his  Insider  Shares for the
three year period  commencing  on the  Effective  Date subject to the terms of a
Stock Escrow  Agreement  which the Company will enter into with the  undersigned
and an escrow agent acceptable to the Company.


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Ardent Acquisition Corporation
EarlyBirdCapital, Inc.
November 11, 2004
Page 3





                  8. The  undersigned  intends  to be a member  of the  Board of
Directors of the Company until the earlier of the consummation by the Company of
a Business  Combination or the  liquidation  of the Company.  To the best of the
undersigned's  knowledge,  the biographical information furnished to the Company
and EBC and attached  hereto as Exhibit A is a true and accurate  representation
of  undersigned's  background and is believed to contain all of the  information
required to be disclosed pursuant to Section 401 of Regulation S-K,  promulgated
under the Securities Act of 1933. The undersigned's  Questionnaire  furnished to
the Company and EBC and annexed as Exhibit B hereto is true and  accurate in all
respects. The undersigned represents and warrants that:

(a)  he is  not  subject  to or a  respondent  in  any  legal  action  for,  any
injunction,  cease-and-desist order or order or stipulation to desist or refrain
from  any  act  or  practice  relating  to the  offering  of  securities  in any
jurisdiction;

(b) he has never been  convicted of or pleaded guilty to any crime (i) involving
any fraud or (ii) relating to any financial  transaction or handling of funds of
another person,  or (iii) pertaining to any dealings in any securities and he is
not currently a defendant in any such criminal proceeding; and

(c) he has never been suspended or expelled from membership in any securities or
commodities  exchange or association or had a securities or commodities  license
or registration denied, suspended or revoked.

                  9. The undersigned has full right and power, without violating
any agreement by which he is bound,  to enter into this letter  agreement and to
serve as a member of the Board of Directors of the Company.

                  10.  The  undersigned   authorizes  any  employer,   financial
institution, or consumer credit reporting agency to release to EBC and its legal
representatives  or agents (including any investigative  search firm retained by
EBC),  purely for the purposes of the Company's  IPO, any  information  they may
have about the undersigned's occupation, avocations,  associations,  educational
achievements,  credit and debts,  driving license and driving record,  character
and general  reputation  ("Information").  Neither  EBC nor its agents  shall be
violating the  undersigned's  right of privacy in any manner in  requesting  and
obtaining  the  Information  and  the  undersigned  hereby  releases  them  from
liability for any damage whatsoever in that connection.



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Ardent Acquisition Corporation
EarlyBirdCapital, Inc.
November 11, 2004
Page 4





                  11. As used herein, (i) a "Business Combination" shall mean an
acquisition  by merger,  capital  stock  exchange,  asset or stock  acquisition,
reorganization or otherwise,  of an operating  business selected by the Company;
(ii)  "Insiders"  shall mean all  officers,  directors and  stockholders  of the
Company  immediately  prior to the IPO; (iii) "Insider Shares" shall mean all of
the shares of Common Stock of the Company  owned by an Insider prior to the IPO;
and (iv) "IPO  Shares"  shall  mean the  shares of  Common  Stock  issued in the
Company's IPO.

                                                     Robert Brill
                                                     ---------------------
                                                     Print Name of Insider


                                                     /s/ Robert Brill
                                                     ---------------------
                                                     Signature


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EXHIBIT A

            Robert Brill has been a member of our board of  directors  since our
inception. Dr. Brill has been a managing partner of Newlight Associates, a group
of venture  capital funds that invest equity capital in  information  technology
companies,  since he co-founded  Newlight in August 1997. From September 1988 to
December  2003,  Dr.  Brill was a managing  partner of  PolyVentures,  a venture
capital fund whose principal  investment focus was on early stage investments in
technology  companies.  Dr.  Brill has been a director of Standard  Microsystems
Corporation,  a Nasdaq listed provider of  semiconductor  systems  solutions for
high-speed communication and computing applications,  since July 1994. Dr. Brill
was a  founding  member of the  Technical  Advisory  Board of the  Semiconductor
Research Corporation and a member of Phi Beta Kappa and Tau Beta Pi. He received
a B.A. and B.S. with high honors from Lehigh  University  and a Ph.D. in Physics
from Brown University.