CARY, N.C.–(BUSINESS WIRE)– Cornerstone Building Brands, Inc.(NYSE: CNR), the largest manufacturer of exterior building products in North America, today announced that its Board of Directors has appointed James (Jim) Keppler as Executive Vice President, Operations. Mr. Keppler will assume the role effective September 21, 2020 and will report directly to the Chairman of the Board and Chief Executive Officer, James S. Metcalf.