Claim: Helmut Ruska (June 7, 1908, Heidelberg - August 30, 1973) earned his medical degree and worked closely with his brother Ernst Ruska, with whom he developed the electron microscope with.
Evidence: Helmut Ruska (June 7, 1908, Heidelberg - August 30, 1973) was a German physician and biologist from Heidelberg. After earning his medical degree, he spent several years working as a physician at hospitals in Heidelberg and Berlin. During this time, he also worked closely with his brother Ernst Ruska (1906-1988) and brother-in-law Bodo von Borries (1905-56), who were both research scientists at Siemens-Reiniger-Werke. Ernst Ruska was the inventor of the electron microscope, and later winner of a Nobel Prize. Through close association with his brother, Helmut Ruska is remembered for developing the electron microscope for biological and medical applications.