Marten is a professor of history and chairs the history department at Marquette University, where he teaches courses on the Civil War and on children’s history. He is the author of The Children’s Civil War (1998), which was selected as an “Outstanding Academic Book” by Choice Magazine, and Sing Not War: The Lives of Union and Confederate Veterans in Gilded Age America (2011). He also directs Children in Urban America , an online archive of documents related to the history of children.