who was this 70s researcher who questioned evolution?

Hi, I heard about a researcher of the 1970's. He came to the conclusion through his research, and he was the leading researcher in his time in his field, I think it had to do with genetics and evolution, that it is possible that Darwin's theory of evolution is false. This is an interesting case because it could be used as an example to break the ice for people who don't believe in evolution because he was not motivated by religious beliefs, he came to this belief solely by his research, which to an agnostic/atheistic scientist would be a more effective way at convincing them. Then, after such people realize that there's someone not motivated by religious beliefs that came to question evolution, they may have more room in their mind to come to a level of faith or be more open to the possiblity of creation.
Does anyone know who this researcher was? I really want to know.