John Bierwirth, American lawyer and businessman (b. 1924)

John Cocks (Jack) Bierwirth (21 January 1924 in Lawrence, Nassau County, New York – 26 May 2013 in Freeport, New York) was an American lawyer and businessman. Bierwirth was an attorney by education, and a banking and financial expert by trade. He was best known as the CEO of Grumman during the 1970s and 1980s, a period of considerable reduction and downsizing in defense- and space-related industries.