Martin Pengelly is the Washington-based breaking news correspondent for Guardian US. Born in Leeds, UK, he played rugby for Durham University and Rosslyn Park FC and worked for Rugby News, the Guardian and the Independent before moving to the US in 2012. Since then, he has written about politics, books, and rugby in America. His work has also appeared in Sports Illustrated and the New York Times. Brotherhood is his first book. H. R. McMaster is the Fouad and Michelle Ajami Senior Fellow at the Hoover Institution and Stanford University. He is also the Susan and Bernard Liautaud Fellow at The Freeman Spogli Institute and Lecturer at the Stanford Graduate School of Business. He serves as chairman of the advisory board of the Center on Military and Political Power at the Foundation for Defense of Democracies and the Japan Chair at the Hudson Institute. A native of Philadelphia, H.R. graduated from the United States Military Academy in 1984. He served as a U.S. Army officer for thirty-four years and retired as a lieutenant general in 2018. He remained on active duty while serving as the twenty-sixth assistant to the president for national security affairs. He taught history at West Point and holds a PhD in history from the University of North Carolina at Chapel Hill.