He graduated from Harvard College in 1942 (magna cum laude, highest honors), just months after the beginning of US involvement in the Second World War.
As a supporter of African unity with his wife Ann (an economist), he advised Kwame Nkrumah, Ghana's first President.
He left Madison in the early 1970s, citing lack of opportunities for his wife Ann, and from 1972 to 1974 both of them worked in senior positions at the University of Zambia,[4] and later in Zimbabwe.
Seidman returned to the US and a permanent Professorship at Boston University Law School in about 1974, remaining there past retirement (1992) until 2013 when he was 93 years old.
The Seidmans were among several families who established one of the first interracial planned communities on the East Coast of the US, at Village Creek in Norwalk, Connecticut in the 1950s, and some of their children were born there.