He was involved in writing scenes and continuities for a number of screenplays, including the war film The Big Parade in 1925, and Hell's Angels.

Behn retired from screenwriting in the 1930s; he worked as a creative writing professor at the University of Arizona from 1938 to 1947 and co-founded the University of Arizona Press; he would later move to Connecticut and transition to children's literature.

[1][2] His son, Peter Behn was cast as young Thumper in the film Bambi.

[3] Behn's translations of haiku provided the texts for two works by Norman Dinerstein: Book Poems: Poems from National Children's Book Week 1959–1998, page 26.

HARRY BEHN DEAD; AN EARLY SCENARIST (obituary on page 38 of the New York Times, Monday, September 10, 1973)