CHICAGO, DATED 1960
Nyvall was the son of a prominent churchman and educator with the same name. Nyvall was was a famous draft protester, finally enlisted, and was a surgical technician in WW2. He was torpedoed and rescued twice on the way to participate in the D-Day Landing.
He was then was recruited for espionage work, fought his way out of capture, armed only with a bayonet, in the Battle of the Bulge.
He resumed his studies and career as an artist after the war, was hospitalized for a time, ultimately diagnosed as epileptic, and was active as a sculptor in Chicago until the late 80s--early 90s. He was affiliated for a time with the Contemporary Art Workshop in Chicago.
His work is in the collection of the Whitney Museum and the Art Institute of Chicago.
Dates of his birth and death are not known.