Willi Hennig
Emil Hans Willi Hennig was a German biologist and zoologist who is considered the founder of phylogenetic systematics, otherwise known as cladistics. In 1945 as a prisoner of war, Hennig began work on his theory of cladistics, which he published in German in 1950, with a substantially revised English translation published in 1966. With his works on evolution and systematics he revolutionised the view of the natural order of beings. As a taxonomist, he specialised in dipterans.
20 April 1913
Born on the same birth date (20 April 1913): Mimis Fotopoulos
Born on the same birth day (20 April): Betty Cuthbert • Dave Bancroft • Don Mattingly • George Takei • John Paul Stevens • Kostis Hatzidakis • Louka Katseli • Matthias Kuhle • N. Chandrababu Naidu • Peter S. Beagle
Born in the same month (April 1913): Keiko Fukuda • Louise Currie • Luz Long • Muddy Waters • Nicolas Grunitzky • Norman Parkinson • Philip Abelson • Rose Murphy • Stefan Heym