Callen is a long-time community activist. In 1982 he was a co-founder and charter member of the University of Wisconsin’s first LGBT group, the 10% Society. He was also a co-founder and the first Artistic Director of Madison’s Proud Theater, a queer youth theater group that has been creating art out of the experiences of queer youth since 1999. He is still an adult mentor for the group. He served in the late 1990’s on the Dane County Coordinated Response to Domestic Violence’s Same-Sex Domestic Violence Task Force. In 2003 he was named the OutReach Man of the Year. For five years (2005-2010) he was the Artistic Director of Broom Street Theater, Madison’s alternative theater that produces nothing but original works by local authors. In addition to writing more than 20 produced full-length plays, many of them on queer and other progressive issues, he is a published free-lance writer and photographer, most recently in the online publication, Life After Hate. Is first book, My Queer Life, a collection of essays, poems, speeches, and more was recently accepted for publication.