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.

The two firms confirmed in May that they were in merger talks. Their combination became official Sept. 1.