August Weismann, German biologist, zoologist, and geneticist (d. 1914) was born on January 17, 1834.

Prof August Friedrich Leopold Weismann FRS (For), HonFRSE, LLD was a German evolutionary biologist. Ernst Mayr ranked him as the second most notable evolutionary theorist of the 19th century, after Charles Darwin. Weismann became the Director of the Zoological Institute and the first Professor of Zoology at Freiburg.