A former managing partner of Am Law 200 firm Saul Ewing Arnstein & Lehr has left after more than four decades with the firm, moving his practice to Conshohocken-based Royer Cooper Cohen Braunfeld, in hopes of returning to the kind of midsize firm atmosphere where he started his career.

David Antzis has been at Saul Ewing for his entire career, since 1978 when the firm had about 60 lawyers. He was the firm's managing partner from 2006 to 2013, during which time the firm expanded into Washington, D.C., Boston and Pittsburgh. Until his departure from the firm, he was co-chair of the mergers and acquisitions practice.