Capel has been an assistant to coach Mike Krzyzewski for the past five years, earning the title associate head coach in 2012. Prior to that, he was head coach at VCU for four seasons and Oklahoma for five. He had a 175-110 record including three NCAA tournament appearances. When he became head coach at VCU, he was 27, the youngest in Division I at the time. He played for Krzyzewski, graduating from Duke in 1997.
As a Duke assistant, he has helped bring in a series of noteworthy recruits, including Jabari Parker, Justise Winslow and Jahlil Okafor, all NBA lottery picks. He also recruited Blake Griffin, the first pick of the 2009 draft, to Oklahoma.