LIMITED POWER OF ATTORNEY


       KNOW ALL MEN BY THESE PRESENTS, that the undersigned constitutes and
appoints David Walker, his true and lawful attorney-in-fact and agent, with
full power of substitution and resubstitution, for him, for the sole purpose
of signing on his behalf any and all Regulatory Filings under the Securities
Act of 1933, the Securities Exchange Act of 1934, the Investment Advisers Act
of 1940 and any amendments and supplements thereto, and to file the same,
with all exhibits thereto, and other documents in connection therewith, with
the Securities and Exchange Commission, granting unto said attorney-in-fact and
agent, full power and authority to do and perform each and every act and thing
requisite and necessary to accomplish the above, as fully as to all intents and
purposes as he might or could do in person, hereby ratifying and confirming all
that said attorney-in-fact and agent, and may lawfully do or cause to be done
by virtue hereof. This Power of Attorney shall continue effective until revoked
by me at any time.




Dated this 7th day of March, 2017.


By: /s/  Zachary Sternberg
__________________________________
         Zachart Sternberg