EXHIBIT A

JOINT FILING AGREEMENT

The undersigned hereby agree that the statement on Schedule 13G with respect to the Common Stock, par value $0.001 per share, of ZIOPHARM Oncology, Inc., dated as of November 27, 2018 is, and any amendments thereto (including amendments on Schedule 13D) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934.

Date: November 27, 2018	WHITE ROCK CAPITAL MANAGEMENT, L.P.
	By:	White Rock Capital (TX), Inc.
		Its General Partner
		By:	/s/ Thomas U. Barton
			Thomas U. Barton
Date: November 27, 2018	WHITE ROCK CAPITAL PARTNERS, L.P.
	By:	White Rock Capital Management, L.P.
		Its General Partner
		By:	White Rock Capital (TX), Inc.
			Its General Partner
			By:	/s/ Thomas U. Barton
				Thomas U. Barton
Date: November 27, 2018	WHITE ROCK CAPITAL (TX), INC.
	By:	/s/ Thomas U. Barton
		Thomas U. Barton
Date: November 27, 2018	THOMAS U. BARTON
	By:	/s/ Thomas U. Barton
		Thomas U. Barton
Date: November 27, 2018	JOSEPH U. BARTON
	By:	/s/ Joseph U. Barton
		Joseph U. Barton