Thomas O’Riordan rejoined Cadwalader, Wickersham & Taft from Quadrant Chambers to launch Cadwalader’s financial regulatory group in London.

O’Riordan, who is now a partner in the New York-based Cadwalader’s financial regulatory practice, was formerly a practicing barrister at Quadrant Chambers. Prior to working at Quadrant, O’Riordan was retained counsel at Cadwalader.

“Tom brings a unique and wide-ranging skill set to our European clients and to our U.S. clients with interests in Europe,” said Cadwalader’s chairman, New York partner Christopher White. “With diverse experience in market regulation, structured finance, banking, funds, insolvency and litigation arising out of these areas, he is an ideal complement to our London team.”

Cadwalader laid off 96 lawyers in late July from its capital markets and global finance groups and 35 associates in January, mostly from its mortgage-backed securities practice.