Heinrich Gross (14 November 1915 – 15 December 2005) was an Austrian psychiatrist, medical doctor and neurologist, a reputed expert as a leading court-appointed psychiatrist, ill-famed for his proven involvement in the killing of at least nine children with physical, mental and/or emotional/behavioral characteristics considered "unclean" by the Nazi regime, under its Euthanasia Program.
Gross was head of the Spiegelgrund children's psychiatric clinic for two years during World War II.
His father died before Heinrich was born and his mother placed him in a Catholic boarding school for his early education.
As Nazi popularity grew and the economy still struggled, these options were widely accepted by the German people.
With the passing of Aktion T4 the killings increased and Gross began to harvest the brains of his victims for further study.
After his release, Gross was arrested by Austrian authorities and put on trial for his involvement in the murder of a child.
In 1955, he completed his training as a specialist in nervous and mental diseases and became the head prison doctor or physician in the former Hospital and nursing home Am Steinhof.
He got promoted to the management of the "Ludwig Boltzmann Institute for the study of the abnormalities of the nervous system" created specially for him in 1968.