American behaviorist (1904–1990).

Born March 20th, 1904 in Susquehanna Depot.

Died August 18th, 1990 at 86 years old in Cambridge (leukemia).

Abraham Maslow

Born April 1st, 1908 in New York City.

Died June 8th, 1970 at 62 years old

William James Sidis

Born April 1st, 1898 in Manhattan.

Died July 17th, 1944 at 46 years old

Sigmund Freud

Born May 6th, 1856 in Příbor.

Died September 23rd, 1939 at 83 years old

Karl Popper

Born July 28th, 1902 in Vienna.

Died September 17th, 1994 at 92 years old

Jean Piaget

Born August 9th, 1896 in Neuchâtel.

Died September 16th, 1980 at 84 years old