which company or organization used to publish it?
Lawrence E. Spivak.
Venture Science Fiction
n late 1949, publisher Lawrence E. Spivak launched "The Magazine of Fantasy"
who is the author of venture science fiction? It was an American digest-size science fiction magazine. when was it published? From 1957 to 1958.
wiki:15392721
Venture Science Fiction [SEP] First US run
In late 1949, publisher Lawrence E. Spivak launched "The Magazine of Fantasy", one of many new titles in a crowded field of genre magazines. The title was changed to "The Magazine of Fantasy & Science Fiction" (usually abbreviated to "F&SF") with the second issue, and the new magazine rapidly became successful and influential within the science fiction field. The editors were Anthony Boucher and J. Francis McComas, and the managing editor was Robert P. Mills. In 1954, Joseph Ferman, a partner of Spivak's, bought the magazine from him. Ferman subsequently decided to launch a companion magazine, and gave it to Mills to edit.