Exhibit 99 (a)

                        AMENDMENT TO EMPLOYMENT AGREEMENT

         This Amendment to Employment Agreement ("Amendment") is made this 27th
day of November, 2007 (the "Second Amendment Date") between the following
parties ("Parties"):

          (i)  BOK Financial Corporation, an Oklahoma corporation ("BOKF"); and,

          (ii) W. Jeffrey Pickryl,  an individual  currently  residing in Tulsa,
               Oklahoma (the "Executive").

         BOKF and Executive, in consideration of the promises and covenants set
forth herein (the receipt and adequacy of which are hereby acknowledged) and
intending to be legally bound hereby, agree as follows:

(1) Purpose of Second  Amendment.  The purpose of this  Second  Amendment  is as
follows:

     (a)  Executive  and  BOKF  have   heretofore   entered  into  that  certain
          Employment  Agreement  dated  September  29,  2003 as  amended by that
          certain  Amendment to Employment  Agreement dated August 30, 2004 (the
          "Agreement").

     (b)  Executive is currently  serving as Senior Executive  Vice-President of
          BOKF.  Executive  is  responsible  for  Bank of  Bank of  Albuquerque,
          National Association,  Bank of Arizona, National Association,  Bank of
          Texas, National Association, and Colorado State Bank and Trust Company
          National Association. Executive currently resides in Dallas, Texas.



     (c)  BOKF desires that  Executive  relocate to Tulsa,  Oklahoma to serve as
          Senior Executive  Vice-President  and Chief Credit Officer of BOKF and
          all of its subsidiary banks ("SEVP-CCO").

     (d)  This Second  Amendment  sets forth the agreement of Executive and BOKF
          respecting Executive's relocation to Tulsa, Oklahoma and assumption of
          the duties as SEVP-CCO of BOKF.

(2)      Relocation and Assumption of Duties as SEVP-CCO of BOKF. Executive
         agrees, as a term of the Employment Agreement, to relocate to Tulsa,
         Oklahoma and assume the duties of SEVP-COO on or before March 31, 2009.

     (a)  Executive shall purchase a home in Tulsa at his  convenience.  At such
          time as  Executive  purchases  a home in  Tulsa  (the  "Oklahoma  Home
          Purchase"),  BOKF shall purchase  Executive's  exiting Texas home. The
          purchase  of   Executive's   existing  Texas  home  (the  "Texas  Home
          Purchase") shall be on the following terms and conditions:

          (i)  The Texas Home Purchase  shall be  consummated  contemporaneously
               with  the  Oklahoma  Home  Purchase  or  as  near  thereto  as is
               practicable.

          (ii) BOKF shall  purchase  the Texas Home on the  following  terms and
               conditions:

               (A)  BOKF shall  engage two real  estate  appraisers  approved by
                    Executive   (provided  such  approval  is  not  unreasonable
                    withheld,   delayed  or  denied)  to  provide  two  separate
                    appraisals.

               (B)  BOKF shall pay Executive  the average of the two  appraisals
                    but not  less  than the  price  paid by  Executive  for such
                    residence,  less the  payoff  amount of any  purchase  money
                    mortgage on the residence.



               (C)  Executive shall convey the residence to BOKF, free and clear
                    of all liens,  claims, and encumbrances (except any purchase
                    money mortgage on the residence), by general warranty deed.

               (D)  Usual and  customary  pro-rations  shall be settled  between
                    Executive and BOKF in connection with such purchase.

               (E)  BOKF   shall   reimburse   Executive,   against   reasonable
                    documentation thereof, for usual and customary closing costs
                    incurred  in  connection  with the  purchase  by BOKF of the
                    Texas  Home,  grossed up for  income  taxes as  provided  in
                    footnote 1.

          (iii) BOKF shall provide the services of a nationally recognized mover
               to  pack  and  move  Executive's  household  goods  to the  Tulsa
               Metropolitan Area.

     (b)  Executive  shall  assume the duties of SEVP-COO and begin to work full
          time in Tulsa at a time  specified  by the  Chief  Executive  Officer,
          provided  the  date  of  such   relocation   shall  not   unreasonably
          inconvenience Executive. Until Executive relocates to Tulsa, Executive
          shall commute to Tulsa for each work week and Executive  shall pay his
          own Dallas living expenses.

     (c)  BOKF shall  reimburse  Executive for his commuting costs and the costs
          of  relocation  and like matters in the  reasonable  discretion of the
          Chief Executive Officer.

     (d)  BOKF shall pay Executive $75,000 (grossed up for income taxes(1)) as a
          relocation bonus, payable with two weeks following the date on which

(1) The gross-up  shall be calculated at the highest  incremental  rate actually
experienced by Executive.  For example, if taxed in Oklahoma,  the rate would be
as follows:  assuming  the highest tax bracket for federal,  the Oklahoma  state
rate less the federal benefit, medicare, and assuming the FICA limit has already
been met, the  composite  rate would be 41% broken down as follows:  35% Federal
4.55% State (after federal deduction) 1.45% Medicare or a total 41%.



          Executive assumes the duties of SEVP-CCO as  contemplated in Paragraph
          2(a).

(3)      Provisions Respecting Successor to Existing Duties. BOKF and Executive
         shall cooperate with each other in recruiting a successor for the
         Executive's current duties and responsibilities.

(4)      Return to Line Position. In the event (i) Executive assumes the duties
         and responsibilities of the Chief Credit Officer of BOKF as herein
         contemplated and (ii) a successor to Stanley A. Lybarger assumes the
         duties and responsibilities of Chief Executive Officer of BOKF (the
         "CEO Successor") and Executive is not the CEO Successor, BOKF shall,
         within a reasonable period of time and subject to the conditions
         hereafter set forth (the "Conditions"), re-assign Executive to a line
         position having (i) the title of Senior Executive Vice-President and
         (ii) materially the same duties and responsibilities and commensurate
         compensation as Executive then has.

          (a)  The Conditions are:

               (i)  Executive  shall have  recruited a chief credit  officer for
                    BOKF (the "CCO");

               (ii) At the time of recruitment,  the Chief Executive Officer and
                    Executive  mutually  agree  the CCO is  qualified  to be the
                    Chief Credit Officer of BOKF; and,

               (iii) The recruited candidate has accepted the position of CCO of
                    BOKF.

          (b)  In the event the Chief  Executive  Officer and  Executive do not,
               each in the  exercise  of his  good  faith  judgment,  agree  the
               Conditions  have been met, the issue or issues shall be presented
               to the full Board of Directors of



               BOKF for determination and the determination of the BOKF Board of
               Directors shall be binding.

          (c)  Executive   acknowledges  that  such  re-assignment  may  require
               Executive  to  relocate  to a BOKF  market  area  other  Tulsa (a
               "Subsequent Relocation").

          (d)  The Subsequent Relocation shall be effected on the same terms and
               conditions,  mutatis mutandi, as those provided in Paragraph 2(b)
               through  2(e) for the  relocation  of  Executive  from  Dallas to
               Tulsa.

(5)      Ratification of the Agreement. The Agreement shall remain in full force
         and effect including, without limitation, those relating to the Term
         thereof.

(6)      Miscellaneous  Provisions.  The  Miscellaneous  Provisions of Paragraph
         10 of the Agreement shall apply to this Amendment.

Dated as of the Amendment Date.

      BOK FINANCIAL CORPORATION


             /s/ Stanley A. Lybarger
      By__________________________________


            /s/ W. Jeffrey Pickryl
        __________________________________
         Executive's Signature