Cornelis Zwikker (19 August 1900 – 20 April 1985) was a Dutch scientist. Zwikker was born in Zaandam as the son of Klaartje Dil and the shopkeeper Klaas Cornelisz Zwikker. He married Johanna Dorothea Theinert (*1901, Zaandam) in 1924 in Zaandam. In 1918 he had started studying chemistry and later physics at the University of Amsterdam, where in 1925 he obtained his PhD with the thesis "Physical properties of wolfram at high temperatures" under supervision of the Noble-laureate Pieter Zeeman. From 1923 he worked as scientific researcher at Philips in Eindhoven, but in 1929 he was appointed professor in theoretical and applied physics at the Delft University of Technology. He was involved in the acoustic design of sound studios and presided over multiple physics-related organizations. In 194