Exhibit 23.3
Consent of Independent Registered Public Accounting Firm
The Board of Directors
Hennessy Advisors, Inc.:
We consent to the use of our report included in this Amendment No. 1 to the Form S-1 registration statement of Hennessy Advisors, Inc. and to the references to our firm under the headings “Selected Financial Data” and “Experts” in the prospectus.
/s/ PISENTI & BRINKER LLP
Petaluma, California
September 1, 2005