Dr Stephen Bull is a long-standing expert on 20th-century military history, with a particular focus on World War I on the Western Front. His many books for Osprey include British Infantryman vs German Infantryman and Canadian Corps Soldier vs Royal Bavarian Soldier.

Adam Hook has illustrated Osprey titles on subjects as diverse as the Aztecs, Roman battle tactics and the modern Chinese Army.
Dr Stephen Bull worked for the National Army Museum and BBC in London before taking up his current post as Curator of Military History and Archaeology with Lancashire Museums. A consultant to the University of Oxford he is also a Member of the Institute for Archaeologists, and has made TV appearances that include the series Battlefield Detectives, news and archaeology features. Published on both sides of the Atlantic and in several languages, he is the author of a number of works for Osprey including titles on tactics in World War II. Dr Bull has been one of the key contributors to the accompanying television series screened in the United Kingdom and North America.
Adam Hook studied graphic design, and began his work as an illustrator in 1983. He specializes in detailed historical reconstructions, and has illustrated Osprey titles on subjects as diverse as the Aztecs, the Ancient Greeks, Roman battle tactics, 19th-century American subjects, the modern Chinese Army, and the history of fortification. His work features in exhibitions and publications throughout the world.