After the war, he became the director of production for the Moody Institute of Science, a Christian evangelical ministry producing science films, described by American Cinematographer as "the biggest little studio in the world" in the 1960s. He published two books affiliated with the MIS: Dust or Destiny and Hidden Treasures.
American Scientific Affiliation
Everest grew up a conservative Baptist, reading the works of Harry Rimmer and George McCready Price. In 1941 he attended a meeting of five evangelical scientists, convened by Moody Bible Institute president William H. Houghton, in Chicago, Illinois, which led to the founding of the American Scientific Affiliation, of which he became the organizational leader and president. Everest led the ASA through its first critical decision, that of how to relate to the pre-existing Deluge Geology Society. Everest was enthusiastic about the DGS's ability to draw "large crowds of non-scientific folk", its offer to allow the fledgling ASA to publish material in their Bulletin of Deluge Geology until it could start its own journal, and the "dignified but definite" tone of that journal, but questioned whether it was wise to become entangled with the DGS due to what he perceived as its "strong Seventh-Day Adventist flavor." After meeting with a group of people with close ties to the DGS, Everest wrote to the ASA executive council advising against "becoming affiliated with a deluge society right off" and that he thought "e would never hope to gain even the Christian geologists if we espoused cause." He wrote to the DGS, gently rebuffing affiliation, but expressing a desire for amicable cooperation. Everest had himself already joined the DGS, but thereafter specifically requested that he be listed as a "subscriber" rather than a "member". The influence of flood geology on the ASA was finally exorcised when, in 1948, Everest approached J. Laurence Kulp to explore the topic in the ASA's upcoming annual convention. Kulp presented a paper on the Antiquity of Hominoid Fossils at this convention and on Deluge Geology at the next convention, resulting in the discomfiture and isolation of Flood Geologists within the ASA. In 1996 he was nominated for the Templeton Prize by a fellow member of the American Scientific Affiliation.