WRB 12.31.2012 EX.23

We consent to the incorporation by reference in the registration statements (No. 333-178121) on Form S-3 and (No. 333-183191), (No. 333-33935), (No. 33-55726), (No. 33-88640) and (No. 333-127598) on Form S-8 of W. R. Berkley Corporation of our reports dated February 28, 2013 with respect to the consolidated balance sheets of W. R. Berkley Corporation as of December 31, 2012 and 2011, and the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2012, and all related financial statement schedules and the effectiveness of internal control over financial reporting as of December 31, 2012, which reports appear in the December 31, 2012 Annual Report on Form 10-K of W. R. Berkley Corporation.