Brian Calhoun is a former NFL athlete who played for the Detroit Lions as a running back. He played college football at the University of Wisconsin, where he was named an All-American and a semifinalist for the Doak Walker Award. Calhoun was selected in the third round of the 2006 NFL Draft and spent three seasons in the league. He retired from football in 2009 and is now known for his work as an entrepreneur and investor.