(Magdeburg 1879 – 1940 Grafeneck)

After completing several years of business training in Rostock, Berlin and finally Mannheim, Grebing dared the experiment of self-employment around 1900 – and failed. This failure turned out to be the turning point of his life. Bankruptcy, accusations of embezzlement and a four-month stay in prison fundamentally changed Grebing's life.
After a suicide attempt in Vienna in 1906, he spent two years in an asylum there before being taken to the Heidelberg psychiatric clinic, and then to Wiesloch in 1908.