Allen has composed two albums of songs for children: Lullabies and Playsongs, and Winterlong, both with lyrics by award-winning poet Robert Priest. Several of these songs backed music videos on Sesame Street.
In the 1980s Allen fronted a rock band called Only Human.
Allen also writes television dramas and documentaries, and creates web and mobile applications. He recently wrote a feature-length documentary Shadow of Gold to be broadcast by Arte (Europe) in November 2018, and he recently co-produced a mobile app called Risk Navigator – a companion piece for the TVO/Kensington documentary Risk Factor.