Exhibit 24

                           LIMITED POWER OF ATTORNEY
                          FOR SECTION 16(a) REPORTING

      KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned hereby makes,
constitutes and appoints Alan Shortall and Deborah Karlak, as the undersigned's
true and lawful attorney-in-fact (the "Attorney-in-Fact"), with full power of
substitution and resubstitution, with the power to act alone for the undersigned
and in the undersigned's name, place and stead, in any and all capacities to:

      1.     prepare, execute and file with the Securities and Exchange
Commission, any national securities exchange or securities quotation system and
Unilife Corporation (the "Company") any and all reports (including any amendment
thereto) of the undersigned required or considered advisable under Section 16(a)
of the Securities Exchange Act of 1934 (the "Exchange Act") and the rules and
regulations thereunder, with respect to the equity securities of the Company,
including Forms 3, 4 and 5; and

      2.     obtain, as the undersigned's representative and on the
undersigned's behalf, information regarding transactions in the Company's equity
securities from any third party, including the Company and any brokers, dealers,
employee benefit plan administrators and trustees, and the undersigned hereby
authorizes any such third party to release any such information to the Attorney-
in-Fact.

      The undersigned acknowledges that:

      1.     this Limited Power of Attorney authorizes, but does not require,
the Attorney-in-Fact to act at his or her discretion on information provided to
such Attorney-in-Fact without independent verification of such information;

      2.     any documents prepared or executed by the Attorney-in-Fact on
behalf of the undersigned pursuant to this Limited Power of Attorney will be in
such form and will contain such information as the Attorney-in-Fact, in his or
her discretion, deems necessary or desirable;

      3.     neither the Company nor the Attorney-in-Fact assumes any liability
for the undersigned's responsibility to comply with the requirements of Section
16 of the Exchange Act, any liability of the undersigned for any failure to
comply with such requirements, or any liability of the undersigned for
disgorgement of profits under Section 16(b) of the Exchange Act; and

      4.     this Limited Power of Attorney does not relieve the undersigned
from responsibility for compliance with the undersigned's obligations under
Section 16 of the Exchange Act, including, without limitation, the reporting
requirements under Section 16(a) of the Exchange Act.

      The undersigned hereby grants to the Attorney-in-Fact full power and
authority to do and perform each and every act and thing requisite, necessary or
convenient to be done in connection with the foregoing, as fully, to all intents
and purposes, as the undersigned might or could do in person, hereby ratifying
and confirming all that the Attorney-in-Fact, or his or her substitute or
substitutes, shall lawfully do or cause to be done by authority of this Limited
Power of Attorney.

      This Limited Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4 or 5 with respect to
the undersigned's transactions in equity securities of the Company, unless
earlier revoked by the undersigned in a signed writing delivered to the
Attorney-in-Fact.

      IN WITNESS WHEREOF, the undersigned has executed this Limited Power of
Attorney as of May 13, 2014.


                                  Signature: /s/ John C. Ryan
                                             ----------------------------------

                                  Print Name: John C. Ryan
                                              ---------------------------------

                                  Title: Senior Vice President, General Counsel
                                          and Secretary