Exhibit
        10.58

      EXECUTIVE
        EMPLOYMENT AGREEMENT

       

      BETWEEN:

      


      GRAN
        TIERRA ENERGY INC.,
        an
        Alberta corporation (“GTEI”)
        and
Gran
        Tierra Energy Inc.,
        a
        Nevada corporation (“Gran
        Tierra”)

       

      (GTEI
        and
        Gran Tierra are collectively referred to herein as, the “Company”)

       

      -
        and
        -

       

      MARTIN
        H. EDEN,
        an
        individual ordinarily resident in the City of Calgary in the Province of
        Alberta

       

      (the
        “Executive”)

       

      (collectively
        referred to as the “Parties”)

       

      RECITALS:

       

      
        	A.	
                The
                  Executive has specialized knowledge and valuable skills and experience
                  which are critical to the management and success of the
                  business.

              


      

       

      
        	
                B.

              	
                The
                  Company wishes to secure the services of the Executive and to ensure
                  that
                  the Executive remains Chief Financial Officer of the
                  business.

              


      

       

      
        	C.	
                The
                  Executive is currently an employee of the Company pursuant to an
                  employment agreement between the Executive and the Company dated
                  December
                  1, 2006 (the “Prior
                  Agreement”).

              


      

      


      
        	D.	
                The
                  Parties wish to set forth their entire understanding and agreement
                  with
                  respect to the subject matter herein and replace the Prior Agreement
                  in
                  its entirety with this Executive Employment Agreement (the “Agreement”).

              


      

      


      THEREFORE,
        the
        Parties agree as follows:

       

      ARTICLE
        1

      DUTIES
        AND RESPONSIBILITIES

       

      1.1 Position

       

      The
        Company confirms the appointment of the Executive to the position of Chief
        Financial Officer. The Executive will undertake those duties and
        responsibilities set out in Schedule “A” to this Agreement as well as those
        duties reasonably assigned to the Executive by the Board of Directors of
        the
        Company (the “Board”).
        The
        Executive will report to the President and Chief Executive Officer. The parties
        agree that the relationship between the Company and the Executive created
        by
        this Agreement is that of employer and employee.


      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      


      1.2 Other
        Engagements

       

      The
        Executive shall not engage in any other business, profession or occupation
        which
        would conflict with the performance of his duties and responsibilities under
        this Agreement, either directly or indirectly, including accepting appointments
        to the boards of other companies without the prior written consent of the
        Board.

      


      1.3 Reassignment

       

      The
        Company shall not reassign the Executive to another position within the Company
        itself, or to a position within a subsidiary, affiliated or related corporate
        entity (“Member
        Company”
or
        “Member
        Companies”)
        or
        alter the duties, responsibilities, title, or reporting lines of the Executive
        or change the location of the Executive’s employment unless the Executive agrees
        to such reassignment or alteration.

       

      1.4 Travel

       

      The
        Executive shall be employed at the Company’s location in Calgary, Alberta. The
        Executive shall be available for such business related travel as may be required
        for the purposes of carrying out the Executive’s duties and responsibilities.
        The Executive shall be entitled to business class tickets for domestic or
        international flights with a duration of more than 1 hour. The Executive
        will be
        entitled to choose suitable accommodations when traveling on Company
        business.

       

      ARTICLE
        2

      TERM
        OF EMPLOYMENT

       

      The
        Executive’s employment with the Company is for no specified duration and
        constitutes at-will employment. The Executive’s employment may be terminated at
        any time by either of the Parties, subject to the provisions of Article
        9.

       

      ARTICLE
        3

      BASE
        SALARY

       

      The
        Executive will be paid an annual salary
        in
        an amount determined by the Board,
        subject to applicable statutory deductions (the “Base
        Salary”).
        The
        Executive’s Base Salary will be payable in accordance with Company practices and
        procedures as they may exist from time to time. Base Salary will be reviewed
        and
        may be increased on an annual basis by the Board, with input from the
        Executive.


      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      


      ARTICLE
        4

      BONUS

       

      4.1 Bonus
        Eligibility

       

      The
        Executive shall be eligible to receive an annual bonus payment in addition
        to
        Base Salary and other compensation for each year of the Executive’s employment
        (the “Bonus”)
        as
        determined by the Board from time to time.

       

      4.2 Bonus
        Payment

       

      The
        Bonus
        shall be payable within sixty (60) days of the end of the fiscal year, and
        will
        be based upon the Executive’s performance during the preceding
        year.

       

      ARTICLE
        5

      BENEFITS

       

      The
        Executive shall be entitled to participate in and to receive all rights and
        benefits under any life insurance, disability, medical, dental, health and
        accident plans maintained by the Company for its employees and for its executive
        officers specifically. The Company will continue to pay the Executive’s Base
        Salary in the event the Executive becomes disabled until such time as the
        Executive begins to receive long-term disability insurance
        benefits.

       

      ARTICLE
        6

      VACATION

       

      The
        Executive will be entitled to five weeks vacation per year. Payment of all
        vacation pay will be at Base Salary. The Executive will arrange vacation
        time to
        suit the essential business needs of the Company. Unused vacation entitlement
        will be carried over into the following calendar year to a maximum entitlement
        of eight weeks in any one year. On leaving the employment of the Company
        for
        whatever reason, the Company will compensate the Executive for any accrued
        but
        unused vacation entitlement based upon the Executive’s then current Base
        Salary.

       

      ARTICLE
        7

      STOCK
        OPTIONS

       

      The
        Company will provide the Executive with the right to participate in stock
        option
        plans and/or incentive award plans approved by the Board.

       

      ARTICLE
        8

      PERQUISITES
        AND EXPENSES

       

      The
        Company recognizes that the Executive will incur expenses in the performance
        of
        the Executive’s duties. The Company shall reimburse the Executive for any
        reasonable out of pocket expenses incurred in the course of
        employment.


      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      


      ARTICLE
        9

      TERMINATION
        OF EMPLOYMENT

       

      9.1 Termination
        Without Notice

       

      This
        Agreement and the Executive’s employment with the Company may be terminated,
        without the Company being obligated to provide the Executive with advance
        notice
        of termination or pay in lieu of such notice, whether under contract, statute,
        common law or otherwise, in the following circumstances:

       

        (a) Voluntary
        Resignation

       

      In
        the
        event the Executive voluntarily resigns, except where the Executive resigns
        for
        Good Reason as provided for in this Agreement, the Executive will give a
        minimum
        of ninety (90) days’ advance written notice to the Company. The
        Executive will not be entitled to receive any further compensation or benefits
        whatsoever other than those which have accrued up to the Executive’s last day of
        active service with the Company. The Company may, at its discretion, waive
        in
        whole or in part such notice with payment in lieu to the Executive;

        

      (b) Cause

       

      "Cause"
        is defined as any of the following: 

      


      (a)
        conviction of, or plea of nolo contendere to, a felony; 

      


      (b)
        participation in a fraud against the Company; 

      


      (c)
        participation in an act of dishonesty against the Company intended to result
        in
        your personal enrichment; 

      


      (d)
        willful material breach of the Company's written policies; 

      


      (e)
        intentional significant damage to the Company's property by you; 

      


      (f)
        material breach of this Agreement; or 

      


      (g)
        conduct by you that, in the good faith and reasonable determination of the
        Board, demonstrates gross unfitness to serve provided that in such event,
        the
        Company shall provide notice to you describing the nature of the gross unfitness
        and you shall thereafter have ten (10) days to cure such gross unfitness
        if such
        gross unfitness is capable of being cured. 


      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      


      The
        Company may not terminate your employment for Cause unless and until you
        receive
        a copy of a resolution duly adopted by the affirmative vote of at least a
        majority of the Board of Directors of the Company ("Board") finding that
        in the
        good faith opinion of the Board, that "Cause" exists and specifying the
        particulars thereof in reasonable detail. 

      


      9.2 Termination
        by the Company without Cause

       

      The
        Company may terminate the Executive’s employment without Cause at any time by
        providing the Executive with a separation package (the “Separation
        Package”)
        equal
        to one years’ Total Cash Compensation.

      


      “Total
        Cash Compensation” is defined as the annualized amount of Base Salary plus Bonus
        Payment for the prior 12-month period.

       

      The
        Separation Package shall be payable in a lump sum within thirty (30) days
        of
        termination.

       

      9.3 Termination
        by the Executive for Good Reason. 

      


      Should
        the Executive terminate his employment for Good Reason, as hereinafter defined,
        he shall receive the Separation Package set out in section 9.2. Failure of
        the
        Executive to terminate his employment on the occurrence of any event which
        would
        constitute Good Reason shall not constitute waiver of his right under this
        section 9.3. Notwithstanding the foregoing, the Executive may terminate his
        employment for Good Reason so long as the Executive tenders his resignation
        to
        the Company within thirty (30) days after the occurrence of the event that
        forms
        the basis for the resignation for Good Reason; provided, however, that the
        Executive must provide written notice to the Company describing the nature
        of
        the event that the Executive believes forms the basis for the resignation
        for
        Good Reason, and the Company shall thereafter have ten (10) days to cure
        such
        event. 

      


      “Good
        Reason” is defined as the occurrence of any of the following without the
        Executive’s express written consent:

      


      
        	
              	(a)	
                an
                  adverse change in the Executive’s position, titles, duties or
                  responsibilities (including new, additional or changed formal or
                  informal
                  reporting responsibilities) or any failure to re-elect or re-appoint
                  him
                  to any such positions, titles, duties or offices, except in connection
                  with the termination of his employment for
                  Cause;

              


      

      


      
        	
              	(b)	
                a
                  reduction by the Company of the Executive’s Base Salary except to the
                  extent that the annual base salaries of all other executive officers
                  of
                  the Company are similarly reduced or any change in the basis upon
                  which
                  the Executive’s annual compensation is determined or paid if the change is
                  or will be adverse to the Executive except that an award of annual
                  performance bonuses by the Company’s Compensation Committee (and approved
                  by the Board of Directors) are discretionary and in no instance
                  shall be
                  considered adverse to Executive if such performance bonus is reduced
                  from
                  a prior year or if an annual performance bonus is not
                  paid;

              


      


      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      


      
        	
              	(c)	
                a
                  Change in Control (as defined below) of the Company occurs;
                  or

              


      

      


      
        	
              	(d)	
                any
                  breach by the Company of any material provision of this
                  Agreement.

              


      

      


      A
“Change
        in Control” is defined as: 

       

      (a)
        a
        dissolution, liquidation or sale of all or substantially all of the assets
        of
        the Company;

       

      (b)
        a
        merger or consolidation in which the Company is not the surviving
        corporation;

       

      (c)
        a
        reverse merger in which the Company is the surviving corporation but the
        shares
        of the Company’s common stock outstanding immediately preceding the merger are
        converted by virtue of the merger into other property, whether in the form
        of
        securities, cash or otherwise; or 

      


      (d)
        the
        acquisition by any person, entity or group within the meaning of Section
        13(d)
        or 14(d) of the Exchange Act, or any comparable successor provisions (excluding
        any employee benefit plan, or related trust, sponsored or maintained by the
        Company or any affiliate of the Company) of the beneficial ownership (within
        the
        meaning of Rule 13d-3 promulgated under the Exchange Act, or comparable
        successor rule) of securities of the Company representing at least fifty
        percent
        (50%) of the combined voting power entitled to vote in the election of
        directors.

       

      ARTICLE
        10

      DIRECTORS/OFFICERS
        LIABILITY

       

      10.1 Indemnity

      


      Gran
        Tierra shall provide to the Executive indemnification in accordance with
        the
        Indemnification Agreement entered into between Gran Tierra and the
        Executive.

       

      10.2 Insurance

      


      
        	
              	(a)	
                Gran
                  Tierra shall purchase and maintain, throughout the period during
                  which the
                  Executive acts as a director or officer of Gran Tierra or a Member
                  Company
                  and for a period of two years after the date that the Executive
                  ceases to
                  act as a director or officer of Gran Tierra or a Member Company,
                  directors’ and officers’ liability insurance for the benefit of the
                  Executive and the Executive’s heirs, executors, administrators and other
                  legal representatives, such that the Executive’s insurance coverage is, at
                  all times, at least equal to or better than any insurance coverage
                  Gran
                  Tierra purchases and maintains for the benefit of its then current
                  directors and officers, from time to
                  time.

              


      


      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      


      
        	
              	(b)	
                If
                  for any reason whatsoever, any directors’ and officers’ liability insurer
                  asserts that the Executive or the Executive’s heirs, executors,
                  administrators or other legal representatives are subject to a
                  deductible
                  under any existing or future directors’ and officers’ liability insurance
                  purchased and maintained by Gran Tierra for the benefit of the
                  Executive
                  and the Executive’s heirs, executors, administrators and other legal
                  representatives, Gran Tierra shall pay the deductible for and on
                  behalf of
                  the Executive or the Executive’s heirs, executors, administrators or other
                  legal representatives, as the case may
                  be.

              


      

       

      10.3 Survival

       

      The
        provisions of sections 10.1 and 10.2 of this Agreement shall survive the
        termination of this Agreement or the employment of the Executive with Gran
        Tierra and such provisions shall continue in full force and effect in accordance
        with such Indemnification Agreement and the provisions of this Agreement
        for the
        benefit of the Executive.

       

      ARTICLE
        11

      NON-COMPETITION
        AND CONFIDENTIALITY

       

      11.1 Non-Competition

       

      The
        Executive recognizes and understands that in performing the duties and
        responsibilities of his employment as outlined in this Agreement, he will
        be a
        key employee of the Company and will occupy a position of high fiduciary
        trust
        and confidence, pursuant to which he has developed and will develop and acquire
        wide experience and knowledge with respect to all aspects of the services
        and
        businesses carried on by Gran Tierra and its Member Companies and the manner
        in
        which such businesses are conducted. It is the expressed intent and agreement
        of
        the Executive and of the Company that such knowledge and experience shall
        be
        used solely and exclusively in the furtherance of the business interests
        of Gran
        Tierra and its Member Companies and not in any manner detrimental to them.
        The
        Executive therefore agrees that so long as he is employed by the Company
        pursuant to this Agreement he shall not engage in any practice or business
        in
        competition with the business of Gran Tierra or any of its Member
        Companies.

       

      11.2 Confidentiality

       

      The
        Executive further recognizes and understands that in the performance of his
        employment duties and responsibilities as outlined in this Agreement, he
        will be
        a key employee of the Company and will become knowledgeable, aware and possessed
        of all confidential and proprietary information, know-how, data, strategic
        studies, techniques, knowledge and other confidential information of every
        kind
        or character relating to or connected with the business or corporate affairs
        and
        operations of Gran Tierra and its Member Companies and includes, without
        limitation, geophysical studies and data, market data, engineering information,
        shareholder data, client lists, compensation rates and methods and personnel
        information (collectively “Confidential
        Information”)
        concerning the business of Gran Tierra and its Member Companies. The Executive
        therefore agrees that, except with the consent of the Board, he will not
        disclose such Confidential Information to any unauthorized persons so long
        as he
        is employed by the Company pursuant to this Agreement and for a period of
        24
        months thereafter; provided that the foregoing shall not apply to any
        Confidential Information which is or becomes known to the public or to the
        competitors of Gran Tierra or its Member Companies other than by a breach
        of
        this Agreement.


      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      


      11.3 Following
        Termination of Agreement

       

      Subject
        to this provision and without otherwise restricting the fiduciary obligations
        imposed upon, or otherwise applicable to the Executive as a result of the
        Executive having been a senior officer and key employee of the Company, the
        Executive shall not be prohibited from obtaining employment with or otherwise
        forming or participating in a business competitive to the business of the
        Company after termination of this Agreement and the Executive’s employment with
        the Company.

       

      ARTICLE
        12

      CHANGES
        TO AGREEMENT

       

      Any
        modifications or amendments to this Agreement must be in writing and signed
        by
        all Parties or else they shall have no force and effect. Notwithstanding
        the
        foregoing, the Company may assign this agreement to a Member Company, without
        the consent of the Executive.

       

      ARTICLE
        13

      ENUREMENT

       

      This
        Agreement shall enure to the benefit of and be binding upon the Parties and
        their respective successors and assigns, including without limitation, the
        Executive’s heirs, executors, administrators and personal
        representatives.

       

      ARTICLE
        14

      GOVERNING
        LAW

       

      This
        Agreement shall be construed in accordance with the laws of the Province
        of
        Alberta and the laws of Canada applicable therein.

       

      ARTICLE
        15

      NOTICES

       

      15.1 Notice
        to Executive

       

      Any
        notice required or permitted to be given to the Executive shall be deemed
        to
        have been received if delivered personally to the Executive or sent by courier
        to the Executive’s home address last known to the Company.


      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      


      15.2 Notice
        to Company

       

      Any
        notice required or permitted to be given to the Company shall be deemed to
        have
        been received if delivered personally to, sent by courier, or sent by facsimile
        to:

       

      Gran
        Tierra Energy Inc.

      300,
        611-10th
        Avenue
        S.W.

      Calgary,
        Alberta, Canada, T2R 0B2

      Fax:
        (403) 265-3242

      Attn:
        Chief Executive Officer

       

      ARTICLE
        16

      WITHHOLDING

       

      All
        payments made by the Company to the Executive or for the benefit of the
        Executive shall be less applicable withholdings and deductions.

       

      ARTICLE
        17

      INDEPENDENT
        LEGAL ADVICE

       

      The
        Executive acknowledges that the Executive has been advised to obtain independent
        legal advice with respect to entering into this Agreement, that he has obtained
        such independent legal advice or has expressly deemed not to seek such advice,
        and that the Executive is entering into this Agreement with full knowledge
        of
        the contents hereof, of the Executive’s own free will and with full capacity and
        authority to do so.

      


      ARTICLE
        18

      REPLACEMENT
        OF PRIOR AGREEMENT

      


      The
        Parties acknowledge that the Prior Agreement is hereby replaced in its entirety
        by this Agreement. Pursuant to Article 12 of the Prior Agreement, this Agreement
        shall be effective, and the Prior Agreement shall be terminated, upon the
        execution of this Agreement by the Parties. Upon such execution, all provisions
        of the Prior Agreement are hereby superseded in their entirety and replaced
        herein and shall have no further force or effect.

      


      (remainder
        of page intentionally left blank)


      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      


      IN
        WITNESS OF WHICH
        the
        Parties have duly executed this Agreement as of the date set forth below,
        with
        an effective date as of June 17, 2008.

       

      
        	
                 GRAN
                  TIERRA ENERGY INC., an Alberta  corporation

              	 	
                GRAN
                  TIERRA ENERGY INC., a Nevada corporation

              
	 	 	 	
                 

              	
                 

              
	
                 By:

              	
                /s/
                  Dana Coffield

              	 	
                By:

              	
                /s/
                  Dana
                  Coffield

              
	 	
                 
                  Name: Dana Coffield

              	 	 	
                Name:
                  Dana Coffield

              
	 	
                 
                  Title:   President and CEO

              	 	 	
                Title:  
                  President and CEO

              
	
                Date:

              	17
                June 2008 	 	Date: 	
                17
                  June 08

              
	 	 	 	 	 
	 	 	 	
                EXECUTIVE

              
	 	 	 	 	
                 

              
	 	 	 	
                By:

              	
                /s/
                  Martin H. Eden

              
	 	 	 	 	
                Martin
                  H. Eden

              
	 	 	 	 	 
	 	 	 	
                Date:

              	June
                17, 2008


      

      


      
        	
                SIGNED,
                  SEALED & DELIVERED

              
	
                In
                  the presence of:

              
	
                 

              
	
                 

              
	
                /s/
                  Sonya Messner

              
	
                                         Witness
                   

              


      


      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      

      


      SCHEDULE
        A

      


      Duties
        & Responsibilities

      


      · Management
        of financing, accounting, treasury, tax, risk management, compliance/reporting
        and investor relations functions of Gran Tierra Energy Inc. and its
        subsidiaries

      


      · Coordination
        of financial functions of operating subsidiaries