The Creation Research Society (CRS) is a Christian research group that engages in creation science. The organization has produced various publications, including a journal and a creation-based biology textbook. During the first few years of its existence, different beliefs about Creationism and disagreement over its statement of beliefs resulted in various members of the board and voting members being forced out of the organization.
Walter E. Lammerts formed the organization in the 1950s after becoming concerned that the American Scientific Affiliation was falling under the influence of theistic evolution. It was originally named the Creation Research Advisory Committee in February 1963, and headed by Walter E. Lammerts and Wiliam J. Tinkle with assistance from Henry M. Morris. The committee originally consisted of ten creationists: Lammerts, Tinkle, Morris, John W. Klotz, Frank Lewis Marsh, Edwin Y. Monsma, Duane Gish, Wilbert H. Rusch, John J. Grebe, and R. Laird Harris. The CRS was later formed in June 1963, with the original advisory committee constituting the new society's 'steering committee', with Karl W. Linsenmann, David A. Warriner and John N. Moore joining it at that time. At about the same time, Morris recruited Harold S. Slusher, Thomas G. Barnes, Willis L. Webb and later Clifford L. Burdlick. Finally, Paul A. Zimmerman joined it. By the end of the year had expanded to approximately fifty members. Members with at least an M.Sc. or equivalent were eligible to be voting members.
The organization's early growth allowed Lammerts to purge committee members who were insufficiently active or orthodox. Four committee members were removed: Monsma and Webb for inactivity, Harris for opposing a literal six-day creation, and Warriner after losing his university position and suggesting that the society hire him as a paid promoter. These members were replaced by George F. Howe, Bolton Davidheiser and H. Douglas Dean. Dean and Davidheiser left after only two years, Dean because of his unorthodox views on Evolution, and Davidheiser because he was unable to work with Seventh Day Adventists on the committee. Marsh, an Adventist, left about the same time because he interpreted the society's weekend meetings as a religious affront.