Power of Attorney

The undersigned constitutes and appoints John R. Moore and Jason Haddock, and
each of them, as his true and lawful attorney-in-fact and agent, with the full
power of substitution and resubstitution, from the undersigned and in the
undersigned and in the undersigned's behalf of all Forms 3, 4 and 5 (including)
any amendments thereto) that the undersigned may be required to file with the
U.S. Securities and Exchange Commission as a result of the undersigned's
ownership of or transactions in securities of Array BioPharma Inc. The Authority
of John R. Moore and Jason Haddock under this statement shall continue until the
undersigned is no longer required to file Forms 3, 4 and 5 with regard to the
undersigned's ownership of or transactions in securities of Array BioPharma Inc
unless earlier revoked in writing. The undersigned acknowledges that neither
John R. Moore nor Jason Haddock is assuming any of the undersigned's
responsibilities to comply with Section 16 of the Section 16 of the Securities
Exchange Act of 1934.
Dated: April 27, 2017

/s/ Kyle Lefkoff