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): Allan Houston • Emma Husar • Felix Baumgartner • Johnny Gavin (footballer) • Pat Roberts • Peter Chelsom • Wop May
Born in the same month (April 1913): Antoni Clavé • Charles Vanik • Dieter Grau • Diosa Costello • Frances Langford • Irving Adler • Jean Fournet • Jules Léger • Keiko Fukuda • Ken Carpenter (discus thrower) • Kermit Tyler • Louise Currie • Memos Makris • Mimis Fotopoulos • Muddy Waters • Nikolaos Roussen • Norman Parkinson • Oleg Cassini • Per Borten • Philip Abelson • Ruth Smith (artist) • Shannon Boyd-Bailey McCune • Stefan Heym