Karl Groos

German psychologist and philosopher (1861-1946).

Born December 10th, 1861 in Heidelberg.

Died March 27th, 1946 at 84 years old in Tübingen.

Occupations
non-fiction writer, philosopher, psychologist, university teacher
Wikipedia

The hardest thing you overcome are the ones that give the most meaning. Maxime Lagacé