Bob Cassidy's scholarly work has generally explored strategy, irregular war and military culture. His research and publications include comparative studies on peace operations in Bosnia and Somalia, the Soviet and Russian wars in Afghanistan and Chechnya, and the post-2001 insurgencies in Afghanistan and Pakistan.
His recent research and writing have focused on the absence of strategy and its implications for the West's wars against non-state sectarian militants. Cassidy,
a retired Army colonel, raises questions about the costs and consequences of a propensity for tactics over strategy for the United States and its partners.