Visitor logs show that Derrick A. Bell visited the White House at least twice since President Obama took office. The logs show two visits by an individual of that name on January 29 and 31, 2010. Derrick Albert Bell, the late Harvard professor and controversial scholar in the field of Critical Race Theory has been thrust into national headlines after conservative bloggers at Breitbart.com posted video of Obama lauding his work at a 1991 rally at Harvard.