Shaun Livingston was a 34-year-old father of two when he stepped on campus for his first MBA course. It was February, and Livingston — a former NBA point guard who won three titles with the Warriors — had paid $10,250 for a Harvard class called "The Business of Entertainment, Media and Sports. As he curled his 6-foot-7, 192-pound frame into a desk, Livingston was overcome with jitters: Could he do the coursework?