Marlon Stewart, who was an assistant basketball coach the past two seasons, will join the Oregon State men's basketball program as the director of basketball operations, Wayne Tinkle announced Tuesday.Stewart was an assistant coach at the University of Hawai'i last season and helped lead the Rainbow Warriors to a 17-13 record. He was an assistant coach at the University of Montana in 2016-17 when the Grizzlies went 16-16. He was the defensive coordinator and handled international recruiting at both places.