 Following his coaching with Nigeria, McCullum joined the staff at San Francisco for one season before moving on to be an assistant coach at UCF under Kirk Speraw.In 2010, McCullum became an assistant coach for the Georgia Tech men's basketball team under head coach Paul Hewitt.After Hewitt was fired, McCullum was not retained and became an assistant for the Guangzhou Long-Lions of the Chinese Basketball Association before joining Dana Altman's staff at Oregon as an assistant coach.