POWER OF ATTORNEY

      The undersigned, an executive officer or director of A.
Schulman, Inc., a Delaware corporation, hereby constitutes and
appoints each of J. Bret Treier and Aaron S. Berke his or her
true and lawful attorneys-in-fact and agent(s) with full power
of substitution and resubstitution for him or her and in his or
her name, place and stead, in any and all capacities, to sign
all Securities and Exchange Commission Forms 3, 4, 5 and 144,
including any and all amendments thereto and all electronic
application forms therefor, and to file the same, and other
documents relating thereto, with the Securities and Exchange
Commission, and grants unto said attorney(s)- in-fact and
substitute(s) full power and authority to do each and every act
and thing requested and necessary to be done in and about the
premises as fully to all intents and purposes as he or she might
do in person, and hereby ratifies and confirms all things that
said attorney(s)-in-fact and substitute(s) may lawfully do and
seek to be done by virtue hereof.

      This Power of Attorney shall be valid until such time as it
is revoked by the undersigned in writing.


Date: April 15, 2013

				Heinrich Lingnau-Schneider
					Print name



				/s/ Heinrich Lingnau-Schneider
					Signature