POWER OF ATTORNEY
Know all by these presents that the undersigned hereby constitutes and appoints Andrew
Drechsler and Christine Pellizzari as the undersigned's true and lawful attorney-in-fact to:
(1) prepare, execute in the undersigned's name and on the undersigned's behalf, and
submit to the U.S. Securities and Exchange Commission (the "SEC") a Form ID,
including amendments thereto, and any other documents necessary or appropriate to
obtain codes, passwords, and passphrases enabling the undersigned to make electronic
filings with the SEC of reports required by the Securities Exchange Act of 1934 or any
rule or regulation of the SEC;
(2) execute for and on behalf of the undersigned, in the undersigned's capacity as a
beneficial owner of Insmed Incorporated (the "Company"), Forms 3, 4, and 5 in
accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules
thereunder and Schedules 13D and 13G in accordance with Section 13 of the Securities
Exchange Act of 1934 and the rules thereunder;
(3) 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 or Schedules
13D or 13G, complete and execute any amendment or amendments thereto, and timely
file such form with the SEC and any securities exchange or similar authority; and
(4) take any other action of any type whatsoever in connection with the foregoing which,
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 the 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 that 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 also ratifies hereby any
action previously taken by the attorney-in-fact that would have been authorized by this power of
attorney if it has been in effect at the time such action was taken. The undersigned
acknowledges that the foregoing attorney-in-fact, in serving in such capacity at the request of the
undersigned, is not assuming, nor is the Company assuming, any of the undersigned's
responsibilities to comply with Sections 13 and 16 of the Securities Exchange Act of 1934.
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 and Schedules 13D and 13G 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 the foregoing attorney-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this ____ day of ____________________, 2013.
DAVID MCGIRR
By: ___________________________
Subscribed and sworn to before me this
_____ day of _____________, 2013.
________________________________
Notary Public
