POWER OF ATTORNEY
   Know all by these presents, that the undersigned hereby makes, constitutes and appoints James 
Erlinger III, John Goodacre and Stillman Hanson,  and each of them singly, as the undersigned's true and 
lawful attorneys-in-fact with full power and authority as hereinafter described to:
1.        execute for and on behalf of the undersigned, in the undersigned's capacity as an officer, director 
and/or beneficial owner of Quintiles Transnational Holdings Inc. (the "Company"), (i) Forms 3, 
4, and 5 (including amendments thereto) in accordance with Section 16(a) of the Securities 
Exchange Act of 1934, as amended (the "Exchange Act"), and the rules thereunder, (ii) Form 144 
in accordance with Rule 144 under the Securities Act of 1933, as amended (the "Securities Act"), 
and (iii) Schedules 13D and 13G (including amendments thereto) in accordance with Sections 
13(d) and 13(g) of the Exchange Act and the rules thereunder;
2.        do and perform any and all acts for and on behalf of the undersigned which may be necessary or 
desirable to complete and execute any such Form 3, 4, or 5 (including amendments thereto), Form 
144, or Schedule 13D or 13G (including amendments thereto) and timely file such form with the 
United States Securities and Exchange Commission (the "SEC") and any stock exchange or 
similar authority, including, but not limited to, executing a Form ID for and on behalf of the 
undersigned and filing such Form ID with the SEC;
3.        seek or obtain, as the undersigned's representative and on the undersigned's behalf, information 
regarding transactions in the Company's securities from any third party, including brokers, 
employee benefit plan administrators and trustees, and the undersigned hereby authorizes any 
such person to release any such information to such attorney-in-fact and approves and ratifies any 
such release of information; and
4.        take any other action of any type whatsoever in connection with the foregoing that, in the opinion 
of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the 
undersigned, it being understood that the documents executed by such attorney-in-fact on behalf 
of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain 
such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact's 
discretion.
   The undersigned hereby grants to each attorney-in-fact full power and authority to do and perform 
any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of 
the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or 
could do if personally present, with full power of substitution or revocation, hereby ratifying and 
confirming all the acts such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall 
lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein 
granted.  The undersigned acknowledges that each of the foregoing attorneys-in-fact, in serving in such 
capacity at the request of the undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Sections 13 or 16 of the Exchange Act or Rule 144 under the Securities Act.
   The undersigned hereby revokes any and all prior limited powers of attorney executed for this 
purpose.  This Power of Attorney shall remain in full force and effect until the undersigned is no longer 
required to file Forms 3, 4, and 5 (including amendments thereto), Form 144, and Schedules 13D and 13G 
(including amendments thereto) with respect to the undersigned's holdings of and transactions in 
securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered 
to each of the foregoing attorneys-in-fact.  In addition, at such time as any attorney-in-fact (i) ceases to 
serve as an employee of the Company or any subsidiary of the Company or (ii) resigns as attorney-in-fact 
by the execution of a written resignation delivered to the undersigned or the Company, without any action 
on the part of the undersigned, this Power of Attorney shall be partially revoked solely with respect to 
such individual; such individual shall cease to be an attorney-in-fact under this Power of Attorney; and 
the authority of the other attorneys-in-fact then existing hereunder shall remain in full force and effect.
   IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of 
this 5th day of February, 2015. 

                       By:        /s/  John M. Leonard                        
       
       Print Name:  John M. Leonard