Stephen D. Biddle (born January 19, 1959) is an American author, military historian, policy analyst and columnist whose work concentrates on U.S. foreign policy. Currently, he is the Professor of International and Public Affairs at School of International and Public Affairs, Columbia University. He received recognition for his 2004 book Military Power: Explaining Victory and Defeat in Modern Battle, published through Princeton University Press. He also has worked in groups under Generals Stanley McChrystal and David Petraeus forming U.S. counter-insurgency policy.