From Washington, D. C.; credited as "John Riggs Hansen" in citation for Tombs of the Nobles.
Passed away in early June 1955 on a visit to his native Denmark, his ashes were returned to Washington for burial.
Movie Makers, Dec. 1931, 657.
Obituary in PSA Journal, V. 21, No. 7, Jul. 1955.
Hansen's work is discussed in Charles Tepperman's "Color Unlimited: Amateur Color Cinema in the 1930s" (in Color and the Moving Image, edited by Simon Brown, Sarah Street and Liz Watkins. London: Routledge, 2012).