He coined the term national therapy for ethnic cleansing: ridding the populace of genetic and blood contaminants threatening the psychological and physical health of the German/Aryan population.
[4] He collected the brains of murdered Jews,[2] mentally handicapped children, and other victims, for research in his clinic and for instruction.
[citation needed] Schneider, along with Konrad Zucker, helped Heidelberg become one of the two leading training centres for the killing of children for theoretically scientific purposes, which went on at thirty clinics for three years.
The U.S. occupation authorities barred his reinstatement to the university's medical faculty, even before they learned of his role in the euthanasia program.
On 29 November 1946, Schneider was given to the German justice authorities in Frankfurt am Main, to be a witness in the trial against Werner Heyde.