Francis Simon
Sir Francis Simon ( 2 July 1893 – 31 October 1956 ) , was a German and later British physical chemist and physicist who devised the gaseous diffusion method , and confirmed its feasibility , of separating the isotope Uranium-235 and thus made a major contribution to the creation of the atomic bomb . 
<triplet> Francis Simon <subj> 2 July 1893 <obj> date of birth <subj> 31 October 1956 <obj> date of death