In 1939 he wrote an unproduced radio script, The Littlest Angel, which was published in book form in 1946 and adapted as a musical TV drama for the Hallmark Hall of Fame in 1969. The heartwarming tale, written in just three days in 1939, is about a small boy's adjustment to being an angel in heaven and his gift to the holy infant. The beloved and enduring Christmas story has been reprinted countless times and translated into many languages.Loretta Young made a recording of the story for Decca records released in 1950. The TV version starred Johnny Whitaker, Fred Gwynne and John McGiver. A semi-animated version of the story (much of the motion created by "panning" the camera across the artwork) was produced in the 1950s by Coronet Films, and was widely distributed in 16mm for church and school showings.
His book The Littlest Snowman was also adapted into a film as a segment of Christmas Fairy Tale (12 minutes), which can be viewed on YouTube. Previously, a shorter adaptation narrated by Bob Keeshan had been annually shown on the CBS children's daytime television show Captain Kangaroo.