Together with Walter Gilbert, Müller-Hill purified the lac repressor, the first genetic control protein to be isolated.
He also wrote Murderous Science: Elimination by Scientific Selection of Jews, Gypsies, and Others, Germany 1933-1945.
[4] It "is a devastating indictment of the role German scientists played in Nazi atrocities.
It reveals how prominent scholars and physicians--many of whom were active in the international eugenics movement--not only acquiesced to anti-Semitic laws and extermination camps, but provided a scientific foundation for Hitler's racist policies, advised on the laws that were passed to implement these policies, helped administrate the Final Solution as well as euthanasia programs aimed at the mentally ill, and in extreme cases, such as Dr. Mengele at Auschwitz, personally murdered inmates "in the interests of science."
A video of him discusses genetics and eugenics can be found on the United States Holocaust Memorial Museum website.