Oscar Hertwig was a German embryologist and zoologist known for his research in developmental biology and evolution. Hertwig is credited as the first man to observe sexual reproduction by looking at the cells of sea urchins under the microscope. Wikipedia
Born: April 21, 1849, Friedberg, Germany
Died: October 25, 1922 (age 73 years), Berlin, Germany
Education: Friedrich-Schiller-Universität,
Siblings: Richard Hertwig
Children: Paula Hertwig
Known for: Study of protists