EXHIBIT 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES OXLEY ACT OF 2002

In connection with the annual report of Duff & Phelps Corporation (the “Company”) on Form 10-K/A for the period ended December 31, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Patrick M. Puzzuoli, Executive Vice President & Chief Financial Officer of the Company, certify, to the best of my knowledge, pursuant to Rule 13a-14(b) under the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:


1.	The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and


2.	The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company for the periods presented therein.



Date:	April 23, 2013	/s/ Patrick M. Puzzuoli
		PATRICK M. PUZZUOLI
		Executive Vice President & Chief Financial Officer

Duff & Phelps Corp 10-K/A