Philadelphia-based Saul Ewing and Chicago-based Arnstein & Lehr have merged, the firms announced Tuesday, creating a firm of more than 400 lawyers with 15 offices across the Northeast, Midwest and Florida. The combined firm will be called Saul Ewing Arnstein & Lehr.

Barry Levin, managing partner of Saul Ewing, will continue to serve as managing partner of the merged firm. Jeffrey Shapiro, Arnstein & Lehr’s managing partner, will now lead the combined firm’s Miami office, and will serve on its executive committee.