Exhibit 16.1

April 24, 2017

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Ladies and Gentlemen:

We have read Item 4.01 of Form 8-K dated April 24, 2017 of Authentidate Holding Corp. and are in agreement with the statements contained therein as it regards our firm.  We have no basis to agree or disagree with other statements of the registrant contained in Item 4.01.

Sincerely,

/s/ EisnerAmper LLP