. . . "American astronomer" . "2009Z"^^ . "1927Z"^^ . "Gregory, John F."@en . . "2009-11-14Z"^^ . . "John F. Gregory (1927\u2013November 14, 2009) was an American optical engineer and a popularizer of amateur telescope making. He is credited with the design of a version of the Maksutov telescope called the \"Gregory-Maksutov telescope\"."@en . . "John F. Gregory"@en .