Exhibit 1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, each of the undersigned hereby agrees to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the Common Stock of DUSA Pharmaceuticals, Inc., and that this Agreement be included as an Exhibit to such joint filing.

Each of the undersigned acknowledges that each shall be responsible for the timely filing of any statement (including amendments) on Schedule 13D, and for the completeness and accuracy of the information concerning him or it contained herein, but shall not be responsible for the completeness and accuracy of the information concerning the other persons making such filings, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Dated: April 8, 2010

SRB MANAGEMENT, L.P.
By:		BC Advisors, LLC, its general partner
		By:	/s/ Richard J. Birns
			Name: Richard J. Birns
			Title: Attorney-in-Fact
SRB GREENWAY OPPORTUNITY FUND, (QP), L.P.
By:		SRB Management, L.P., its general partner
		By:	BC Advisors, LLC, its general partner
			By:	/s/ Richard J. Birns
				Name: Richard J. Birns
				Title: Attorney-in-Fact
SRB GREENWAY OPPORTUNITY FUND, L.P.
By:		SRB Management, L.P., its general partner
		By:	BC Advisors, LLC, its general partner
			By:	/s/ Richard J. Birns
				Name: Richard J. Birns
				Title: Attorney-in-Fact
BC ADVISORS, LLC
By:		/s/ Richard J. Birns
		Name: Richard J. Birns
		Title: Attorney-in-Fact
STEVEN R. BECKER
	By:	/s/ Richard J. Birns
		Name: Richard J. Birns
		Title: Attorney-in-Fact
MATTHEW A. DRAPKIN
	By:	/s/ Richard J. Birns
		Name: Richard J. Birns
		Title: Attorney-in-Fact