John Gergen was a science fiction fan from the late 1930s and the 1949s who was a member of the Minneapolis Fantasy Society. ''Tycho'' was published in Minneapolis, Minnesota, U.S.A.

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John Gergen was a science fiction fan in the late 1930s and the 1940s who was a member of the Minneapolis Fantasy Society. ''Tycho'' was published in Minneapolis, Minnesota, U.S.A.

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Two issues of ''Tycho'' appeared, the first in June 1942. The cover was by Morris Dollens with a frontspiece by Sherman Schultz. Contributors of writing were George Dickson, Art Osterlund, A. L. Schwartz, Sherman Schultz, and John Gergen.

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Two issues of ''Tycho'' appeared, the first in June 1942. The cover was by Morris Scott Dollens ([[Science-Fiction Collector]]) with a frontspiece by Sherman Schultz. Contributors of writing were George Dickson, Art Osterlund,A. L. Schwartz, Sherman Schultz, and John Gergen.

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The second issue appeared in November 1942, with a cover by Morris Dollens, and frontspiece by Sherman Schultz, and writing by Sheldon Araas, Redd Boggs ([[Sky Hook]]), Donn Brazier, Bowen Conway, S.A. McElfresh, and John Gergen.

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The second issue appeared in November 1942, with a cover by Morris Dollens, and frontspiece by Sherman Schultz, and writing by Sheldon Araas, Redd Boggs ([[Sky Hook]]), Donn Brazier ([[Frontier]]), [[John B. Michel]] (writing as Bowen Conway) ([[The International Observer of Science and Science Fiction]]), S.A. McElfresh, and John Gergen.

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John Gergen did art work for a number of fanzines, including [[The Fantasite]] and [[Spaceways]].

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John Gergen did art work for a number of fanzines, including [[Spaceways]].

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As well, he collaborated with Poul Anderson on the science fiction short