Hermann Werner Siemens

Hermann Werner Siemens (August 20, 1891 (Charlottenberg) -1969) was a German dermatologist who first described multiple skin diseases and was one of the inventors of the twin study. Siemens' work in twin studies is influential in modern genetics and is used to address the environmental and genetic impacts upon traits. Siemens was involved in racial hygiene and affiliated with the Nazi Party. Provided by Wikipedia