H. J. Muller
Muller's Nobel Prize in Physiology or Medicine in 1946 was "for the discovery that mutations can be induced by X-rays". By then the real interest lay in the same effects caused by gamma rays from nuclear testing. Muller was a wholehearted enthusiast for eugenics, socialism, atheism and other relatively unpopular ideas, but his real contribution was to genetics. One reputable source writes of him: