"1912-06-15Z"^^ . "Kenneth Ross MacKenzie"@en . . "American physicist" . . "Kenneth Ross MacKenzie (June 15, 1912 \u2013 July 4, 2002) together with Dale R. Corson and Emilio Segr\u00E8, synthesized the element astatine, in 1940. MacKenzie received his PhD under Ernest Lawrence at Lawrence Livermore National Laboratory. Lawrence, MacKenzie, and their colleagues devised the first cyclotron. He was a professor of physics at UCLA, where he and Reg Richardson built UCLA's first cyclotron and later a bevatron."@en . . . "2002-07-03Z"^^ . . . . "Mackenzie, Kenneth Ross"@en . . "2002-07-04Z"^^ . . "1912Z"^^ . . . . "2002Z"^^ .