Hill Harper is shaking things up on this season of Covert Affairs as CIA station chief Calder Michaels. The actor and writer stopped by our LA studios recently to talk about his latest role, his upcoming book, and his longstanding friendship with President Barack Obama. Hill, who has already penned four books on topics from personal finance to romantic relationships, is planning to tackle our nation's prison problem in his next tome. He also talked about working alongside President Obama to promote education and why he wishes more people got the chance to see his former Harvard classmate's "wonderful sense of humor." Catch Hill on Covert Affairs every Tuesday at 9/8 Central.