His first children’s book, Perry’s Baltimore Adventure, celebrated the return of the peregrine falcons to Baltimore in 1978. The book is used in the Baltimore and Baltimore County Public Schools to teach urban geography. Among his other books are Doctors in the Movies: Boil the Water and Just Say Aah! and Christians in the Movies: A Century of Saints and Sinners. Dans’s memoir, Life on the Lower East Side, 1937 to 1950, was coauthored with photographer Rebecca Lepkoff and Suzanne Wasserman.