EXHIBIT A

JOINT FILING AGREEMENT

This will confirm the agreement by and among the undersigned that the Schedule 13D filed with the Securities and Exchange Commission on or about the date hereof with respect to the beneficial ownership by the undersigned of the common stock, par value $0.001 per share, of Authentidate Holding Corp., a Delaware corporation, is being filed, and all amendments thereto will be filed, on behalf of each of the persons and entities named below in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

Dated:  December 23, 2016

LAZARUS INVESTMENT PARTNERS LLLP

By: Lazarus Management Company LLC

       its General Partner

By: /s/ Justin B. Borus

Name: Justin B. Borus

Title:  Manager 

LAZARUS MACRO MICRO PARTNERS LLLP

By: Lazarus Management Company LLC

       its General Partner

By: /s/ Justin B. Borus

Name: Justin B. Borus

Title:  Manager 

LAZARUS MANAGEMENT COMPANY LLC

By: /s/ Justin B. Borus

Name: Justin B. Borus

Title:  Manager 

/s/ Justin B. Borus

Justin B. Borus