Staff Sergeant William J. Guarnere (born April 28, 1923) is a former non-commissioned officer with Easy Company, 2nd Battalion, 506th Parachute Infantry Regiment, in the 101st Airborne Division of the United States Army during World War II. Guarnere was portrayed in the HBO miniseries Band of Brothers by Frank John Hughes. Guarnere wrote Brothers in Battle, Best of Friends: Two WWII Paratroopers from the Original Band of Brothers Tell Their Story with Edward Heffron and Robyn Post in 2007.