As heir apparent to DKC founder Dan Klores, Sean Cassidy is one of New York's most influential young agency leaders. He has helped raise the firm's revenue by a third, to more than $20 million, since taking over, moving DKC from a primarily New York-centric agency to one whose accounts are now mostly national.

He is still involved in hands-on account management, and has worked with clients like Rheingold Beer, Song Airlines, and Us Weekly, among many others.

Cassidy rose through the ranks of DKC through a combination of smarts and people skills. While Klores himself built a firm that was a powerhouse in entertainment, politics, sports, and all things that constituted New York's power axis, Cassidy has worked to expand its reach considerably.

Today, DKC works the city as well as anyone, while offering the capabilities of any large PR firm.