Yockelson began working at the National Archives and Records Administration (NARA) in 1988. He started off as a military history specialist in military records. He currently works as an investigative archivist in the Office of the Inspector General at NARA. His main duty is to investigate stolen historical document cases. He is also the head of the Archivist Recovery Team (ART) at NARA.

In 1984, Yockelson graduated from Frostburg State University with his undergraduate degree in history. He earned his Master’s degree in history from George Mason University. Afterwards Yockelson graduated from the Royal Military College of Science, Cranfield University with his Ph.D. in military history.

Mitchell “Mitch” A. Yockelson (born 1962) is a military historian and archivist. He has written four books including, Borrowed Soldiers: Americans Under British Command 1918, and numerous articles for well-known publications. Yockelson is considered one of the foremost authorities on the topic of World War I. Currently he teaches at Norwich University, and works as an Investigative Archivist at the National Archives and Records Administration. Yockelson resides in Annapolis.

Yockelson is the author of four books. His first book, Borrowed Soldiers: Americans Under British Command 1918 was named by London Independent as one of the best books on military history in 2008. It originated from his dissertation on the United States Army during World War I. He is the recipient of the Army Historical Foundation’s Distinguished Writing Award.