Document:

Exhibit 10.19

    CONSULTING
      AGREEMENT

    

    THIS
      CONSULTING AGREEMENT (the "Agreement") is made and entered into as the
      4th
      day of
      April, 2007, but effective as of the 1st
      day of
      May, 2007, by and between Jimmy D. Wright ("Consultant") and Westside Energy
      Corporation (the "Company"). 

    

    RECITALS:

    

    WHEREAS,
      the Company desires to engage Consultant to provide to the Company certain
      consulting services described herein relating to the Company’s business (the
      "Services"), and Consultant is willing and desires to be engaged by the Company
      to provide the Services to the Company, upon the terms, provisions and
      conditions set forth hereinafter; and 

    

    WHEREAS,
      the Company and Consultant desire to set forth the terms, provisions and
      conditions of Consultant's engagement by the Company; 

    

    AGREEMENTS:

    

    NOW,
      THEREFORE, in consideration of the premises and the mutual covenants hereinafter
      set forth and for other good and valuable consideration, the receipt, adequacy
      and sufficiency of which are hereby acknowledged by each of the Company and
      Consultant, each of the Company and Consultant hereby agrees as follows:

    

    l.
      Engagement.
      Subject
      to the terms, provisions and conditions hereinafter stated, the Company hereby
      engages the Consultant to provide the Services to the Company, and Consultant
      hereby accepts such engagement.
      The
      Services shall be consulting services relating to the Company’s business with
      respect to the following matters: 

    

    	(a)  	
            Non-material
              litigation involving the Company; 

          

    

    
      	 	
              (b)

            	
              Location,
                identification and making of recommendations for the acquisition
                of
                additional properties by the
                Company;

            

    

    

    
      	 	
              (c)

            	
              Review,
                analysis, and assistance in negotiating the acquisition of oil and
                gas
                properties selected by the Company;

            

    

    

    
      	 	
              (d)

            	
              Assistance
                of the Company in curing any title problems that it encounters in
                connection with its properties: 

            

    

    

    
      	 	
              (e)

            	
              Assistance
                of the Company in pursuing its exploration, development, operational,
                and
                drilling activities: and 

            

    

    

    
      	 	
              (f)

            	
              Such
                other consulting services with respect to which Consultant has expertise
                and the willingness to provide as from time to time may be requested
                by
                the Company. 

            

    

    

    Notwithstanding
      anything else contained herein, Consultant shall not be obligated to provide
      any
      consulting services with respect to any of the following matters: 

    

    
      	 	
              (t)

            	
              Matters
                pertaining to the Company’s financial or accounting situation or financial
                statements;

            

    

     

    
      	 	
              (u)

            	
              Mergers,
                acquisitions, tender offers, joint ventures, and other similar
                transactions involving the Company;

            

    

     

    
      	 	
              (v)

            	
              New
                products or discoveries, or developments concerning customers or
                suppliers
                relating to the Company (such as gaining or losing a
                contract);

            

    

     

    (w)_ Changes
      in control or management of the Company;

     

    (x) Any
      change in the Company’s auditors;

     

    
      	 	
              (y)

            	
              Events
                regarding the Company’s securities, such as defaults in senior securities,
                splits, dividend changes, public or private sales of additional
                securities; or 

            

    

    

    (z) Bankruptcy
      or receivership involving the Company. 

    

    Consultant
      may be required to provide Services at the Company’s principal executive office
      if necessary and reasonable (or such other location as shall be necessary and
      reasonable), otherwise Consultant may provide Services from his home office.
      To
      the extent requested by the Company, Consultant shall provide Services on at
      least ten (10) days per each month during the term in which Consultant is
      providing Services to the Company, pro rated for any stub month during which
      such term commences or terminates. Consultant shall undertake such travel as
      shall be necessary and reasonable for Consultant to provide Services hereunder.
      In providing Services hereunder, Consultant shall use reasonable efforts, and
      shall perform such duties in a competent, professional and good workman-like
      manner. 

    

    2. Compensation.
      (a) As
      compensation for providing the Services, the Company shall pay to Consultant
      a
      daily rate of $1,000 for each day on which Consultant provides Services to
      Consultant hereunder; provided, however, that the Company shall pay to
      Consultant at least $10,000 per each month during the term in which Consultant
      is providing Services to the Company (i.e. for at least ten days of Services
      per
      month), pro rated for any stub month during which such term commences or
      terminates. Consultant shall be entitled to two bi-monthly payments each in
      the
      amount of $5,000, which may be paid in accordance with the customary payroll
      procedures of the Company from time to time in effect so long as they are paid
      every two weeks, more or less. If Consultant provides Services on more than
      ten
      (10) days in a month during the term in which Consultant is providing Services
      to the Company, then Consultant shall be entitled to invoice the Company for
      the
      monthly fees in excess of $10,000, and the Company shall remit the payment
      of
      the excess fees with the next bi-monthly payment that becomes due 10 days after
      the invoice is submitted. 

    

    (b) The
      Company also agrees to continue Consultant’s coverage in the Company’s medical
      plan throughout the term in which Consultant is providing Services to the
      Company. The Company agrees to waive the COBRA premium for this period of time,
      provided the Consultant elects such coverage under COBRA. 

    

    (c) The
      Company shall reimburse Consultant, from time to time, for all actual,
      reasonable and necessary business expenses incurred by Consultant on behalf
      of
      the Company, to the extent that Consultant has presented to the Company
      documentary evidence, such as a receipt or a paid bill, that states sufficient
      information to establish the amount, date, place, and the essential character
      of
      the expenditure for each such expenditure. 

    

    3.
      Term.
      (a) The
      term
      during which Consultant shall be required to provide Services to the Company
      shall begin on the effective date hereof and shall continue until terminated
      in
      accordance with either subsection (b) or (c) immediately below. 

    

    (b) Consultant
      may, at his election, terminate his engagement hereunder at any time more than
      four months after the effective date hereof for any reason by giving written
      notice to the Company as to his election to terminate, and thereupon
      Consultant's engagement with the Company will terminate after the expiration
      of
      30 days after the giving of the notice, or (if later) on the date specified
      in
      the notice. 

    

    (c) The
      Company may, at its election, terminate Consultant's engagement hereunder at
      any
      time more than 12 months after the effective date hereof for any reason by
      giving written notice to Consultant as to the Company's election to terminate,
      and thereupon Consultant's engagement with the Company will terminate after
      the
      expiration of 30 days after the giving of the notice, or (if later) on the
      date
      specified in the notice. 

    

    (d) Either
      Consultant or the Company may, at their separate elections, terminate
      Consultant's engagement hereunder at any time upon a
      "Change
      in Control" after
      the
      giving of 15 days written notice to the other, and thereupon Consultant's
      employment with the Company will terminate 15 days after the giving of the
      notice or (if later) on the date specified in the notice. For
      purposes of this Agreement, a "Change in Control" shall mean the approval by
      the
      stockholders of the Company of: (i) a merger, consolidation, share exchange
      or
      reorganization involving the Company, unless the stockholders of the Company,
      immediately before such merger, consolidation, share exchange or reorganization,
      own, directly or indirectly immediately following such merger, consolidation,
      share exchange or reorganization, at least 80% of the combined voting power
      of
      the outstanding voting securities of the corporation that is the successor
      in
      such merger, consolidation, share exchange or reorganization in substantially
      the same proportion as their ownership of the voting securities of the Company
      immediately before such merger, consolidation, share exchange or reorganization;
      (ii) a complete liquidation or dissolution of the Company; or (iii) an agreement
      for the sale or other disposition of all or substantially all of the assets
      of
      the Company. 

    

    4.
      Confidentiality.
      

    

    (a) "Confidential
      Information" means and refers to information and materials belonging to the
      Company that are not generally known outside the Company, including, without
      limitation, customers and customer lists, pricing policies, operational
      procedures, sources of supply, methods, formulae, processes, software programs,
      hardware configurations, know-how, computer programs and access codes,
      technological information, information relating to the cost of its products
      and
      services, marketing strategies, and any other information which bears a logical
      relationship to the Confidential Information described above such that
      Consultant knows or should logically conclude that the Company regards the
      information to be Confidential Information. Confidential Information shall
      not
      include any knowledge or information that is already known to the general public
      as of the date of this Agreement, or that becomes known to the general public
      after the date of this Agreement through no breach of Consultant's
      confidentiality obligations. 

    

    (b) Consultant
      hereby recognizes and acknowledges that Consultant may receive Confidential
      Information from the Company or may develop Confidential Information on the
      behalf of the Company. Consultant hereby agrees to maintain on a confidential
      basis all Confidential Information, and Consultant agrees that Consultant shall
      not, without the prior express written consent of the Company, use for
      Consultant's or anyone else's benefit or disclose to any other person any
      Confidential Information, except in connection with Consultant's work on behalf
      of the Company. Consultant hereby acknowledges that, as between the Company
      and
      Consultant, the Company has the complete, sole and full right, title and
      interest in and to the Confidential Information, and that Consultant has no
      rights, expressed or implied, with respect to the foregoing other than those
      expressly provided for to the contrary in a writing signed by both the Company
      and Consultant. Consultant further agrees that Consultant shall, immediately
      upon the Company's request, return to the Company all written Confidential
      Information and all writings regarding oral Confidential Information whether
      such writings were authorized or not. Consultant hereby agrees that the
      confidentiality agreement provided for hereby shall last with respect to any
      Confidential Information for five years after such Confidential Information
      is
      disclosed by the Company to Consultant or developed by Consultant on behalf
      of
      the Company, as the case may be.

    

    (c) Each
      of
      the Company and Consultant hereby acknowledges that they expect that, for
      purposes of providing Services hereunder, Consultant will not need any material
      non-public information (for purposes of United States Federal and state
      securities laws) with respect to the Company or its securities (“Material
      Non-Public Information” herein), and that Consultant does not wish to receive
      any Material Non-Public Information. The Company hereby agrees that, unless
      otherwise consented to by Consultant in writing, the Company shall not provide
      or make available to Consultant any Material Non-Public Information. The Company
      further agrees that, if despite the preceding provisions the Company makes
      available to Consultant, either through inadvertence or otherwise, without
      his
      prior written consent, any adverse Material Non-Public Information, Consultant
      shall have the right (if at that time he genuinely intends to sell some or
      all
      of the securities of Company owned by him) to require the Company to disclose
      immediately the related Material Non-Public Information to the public and to
      the
      SEC by the filing of a Form 8-K; provided that the Company shall have the right
      to delay taking the foregoing action for five business days after it receives
      written notice from Consultant of the exercise of his right to compel disclose,
      if the Company has a legitimate corporate objective (unrelated to the market
      price of the Company’s securities) for delaying such action. The Company
      acknowledges that Consultant will rely on the foregoing when transacting in
      the
      securities of Company. 

    

    5.
      Property
      of the Company.
      Consultant agrees that, upon the termination of Consultant's engagement with
      the
      Company, Consultant will immediately surrender to the Company all property,
      equipment, funds, lists, books, records, and other materials of the Company
      or
      any affiliate thereof in the possession of or provided to Consultant.

    

    6.
      Law
      Governing.
      THIS
      AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
      THE
      STATE OF TEXAS. 

    

    7.
      Notices.
      Any
      notice or request herein required or permitted to be given to any party
      hereunder shall be given in writing and shall be personally delivered or sent
      to
      such party by prepaid mail at the address set forth below the signature of
      such
      party hereto or at such other address as such party may designate by written
      communication to the other party to this Agreement. Each notice given in
      accordance with this paragraph shall be deemed to have been given, if personally
      delivered, on the date personally delivered, or, if mailed, on the third day
      following the day on which it is deposited in the United States mail, certified
      or registered mail, return receipt requested, with postage prepaid.

    

    8.
      Headings.
      The
      headings of the paragraphs of this Agreement have been inserted for convenience
      of reference only and shall in no way restrict or modify any of the terms or
      provisions hereof. 

    

    9.
      Severability.
      If any
      provision of this Agreement is held to be illegal, invalid, or unenforceable
      under present or future laws effective during the term hereof, such provision
      shall be fully severable and this Agreement shall be construed and enforced
      as
      if such illegal, invalid or unenforceable provision had never comprised a part
      of this Agreement and the remaining provisions of this Agreement shall remain
      in
      full force and effect and shall not be affected by the illegal, invalid or
      unenforceable provision or by its severance from this Agreement. Furthermore,
      in
      lieu of such illegal, invalid or unenforceable provision, there shall be added
      automatically as a part of this Agreement a provision as similar in terms to
      such illegal, invalid, or unenforceable provision as may be possible and be
      legal, valid, and enforceable. 

    

    10.
      Entire
      Agreement.
      This
      Agreement embodies the entire agreement and understanding between the parties
      hereto with respect to the subject matter hereof and supersede all prior
      agreements and understandings, whether written or oral, relating to the subject
      matter hereof. 

    

    11.
      Binding
      Effect.
      This
      Agreement shall be binding upon and shall inure to the benefit of each party
      hereto and his, her or its respective successors, heirs, assigns, and legal
      representatives, but neither this Agreement nor any rights hereunder may be
      assigned by any party hereto without the consent in writing of the other party.
      

    

    12.
      Remedies.
      No
      remedy conferred by any of the specific provisions of this Agreement is intended
      to be exclusive of any other remedy, and each and every remedy shall be
      cumulative and shall be in addition to every other remedy given hereunder or
      now
      or hereafter existing at law or in equity or by statute or otherwise. The
      election of any one or more remedies by any party hereto shall not constitute
      a
      waiver of the right to pursue other available remedies. 

    

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    IN
      WITNESS WHEREOF, the undersigned have set their hands hereunto as of the first
      date written above. 

    

      "COMPANY"
          

    

    WESTSIDE
      ENERGY CORPORATION

    

    By:_______________________________________

    Douglas
      G. Manner,
      Chief
      Executive Officer 

    

    Address: 3131
      Turtle Creek Blvd, Suite 1300

    Dallas,
      TX 75219

    

    "CONSULTANT"

    

           
      __________________________________________

    Jimmy
      D.
      Wright

    

    Address: 62
      Hope
      Farm Road

    Missouri
      City, Texas 77459QuickLinks
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Exhibit 4.1    
    

        COMMON STOCK  

	Number	 	 	 	Shares
	
SIRTRIS PHARMACEUTICALS, INC.
	
  INCORPORATED UNDER THE LAWS

OF THE STATE OF DELAWARE
	
 	
 	

 	
 	

CUSIP 82968A 105

SEE REVERSE SIDE FOR CERTAIN DEFINITIONS

THIS CERTIFIES THAT 

IS
THE OWNER OF 

FULLY-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, PAR VALUE OF $0.001 PER SHARE OF SIRTRIS PHARMACEUTICALS, INC.
transferable on the books of the Company by the holder hereof, in person, or by duly authorized attorney upon surrender of this Certificate properly endorsed. The shares represented by this
Certificate are subject to the provisions of the certificate of incorporation and by-laws of the Company as from time to time amended or restated. This Certificate is not valid until
countersigned by the Transfer Agent and registered by the Registrar. 

Witness
the facsimile signatures of its duly authorized officers. 

	
 CHAIRMAN OR VICE CHAIRMAN

OR PRESIDENT OR VICE PRESIDENT	
 	

SECRETARY OR ASSISTANT SECRETARY

OR TREASURER OR ASSISTANT TREASURER
	
 Countersigned and Registered:	
 	

 
	
COMPUTERSHARE TRUST COMPANY, N.A.	
 	

 

	

By:	
 	

 	
 	

 
	 	 	
 Transfer Agent and Registrar

Authorized Signature	 	 
	

SIRTRIS PHARMACEUTICALS, INC.  

THE
RECORD HOLDER OF THIS CERTIFICATE MAY OBTAIN FROM THE SECRETARY OF THE COMPANY, UPON REQUEST AND WITHOUT CHARGE, A FULL STATEMENT OF THE DESIGNATION, RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS
OF THE SHARES OF EACH CLASS AUTHORIZED TO BE ISSUED AND THE DESIGNATION, RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF EACH SERIES OF PREFERRED SHARES AUTHORIZED TO BE ISSUED SO FAR AS THE SAME HAVE
BEEN FIXED AND THE AUTHORITY OF THE BOARD OF DIRECTORS TO DESIGNATE AND FIX THE RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF OTHER SERIES. 

The
following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws
or regulations: 

	TEN COM — as tenants in common

TEN ENT — as tenants by the entireties	 	UNIF GIFT MIN ACT —	 	 	 	 
	JT TEN — as joint tenants with right of survivorship and not as tenants in common	 	 	 	
 (Custodian)	Custodian	
 (Minor)

	 	 	Under Uniform Gifts to Minors Act	 	 
	
 	
 	

 (State)	
 	

 

Additional abbreviations may also be used though not in the above list. 

	For value received,	 	 	 	hereby sell, assign and transfer unto	 
	 	 	
	 	 	 

	
 PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE
	

	
 	

 
	

	
 	

 
	
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE OF ASSIGNEE)

	

	

	

	

	
 	

shares
	
 of the stock represented by the within certificate, and do hereby irrevocably constitute and appoint
	

	
 	

Attorney

to transfer the said stock on the books of the within named Company with full power of substitution in the premises. 

	Dated	 	 	 	X	 
	 	 	
	 	 	

	
 	
 	

 	
 	

X	

 
	 	 	 	 	 	 	

	 	 	 	 	 	NOTICE: THE SIGNATURE ON THIS ASSIGNMENT MUST CORRESPOND EXACTLY WITH THE NAME WRITTEN UPON THE FACE OF THE CERTIFICATE.
	 Signature(s) Guaranteed:	 	 	 
	

 THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION, AS DEFINED IN RULE 17AD-15 UNDER THE SECURITIES AND EXCHANGE ACT OF 1934, AS AMENDED	
 	

 	

 

KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, OR DESTROYED, THE COMPANY MAY REQUIRE A BOND OF INDEMNITY AS A CONDITION TO
THE ISSUANCE OF A REPLACEMENT CERTIFICATE.

QuickLinks

Exhibit 4.1

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