Paul W. Theiss has been elected chairman of Mayer Brown effective June 1. Theiss will succeed Herbert W. Krueger, who under the terms of the firm's partnership agreement is not eligible for another term. Theiss, 52, began his career with Mayer Brown in 1985. He is a member of its management committee and formerly was a co-leader of its global corporate & securities practice. Theiss has been long recognized as a leader in the M&A and capital markets areas by publications including Chambers and International Financial Law Review. Theiss has an undergraduate degree from Amherst College and a J.D. from the University of Chicago Law School.