 CARY, N.C.--BUSINESS WIRE--Cornerstone Building Brands, Inc. NYSE: CNR the Company, the largest manufacturer of exterior building products in North America, today announced that it has appointed Alena Brenner as Executive Vice President, General Counsel and Corporate Secretary. Ms. Brenner assumed the role leading the Companys legal, compliance and risk management functions on April 5, 2021 and reports directly to the Chairman of the Board and Chief Executive Officer, James S. Metcalf. 