He's no longer active of course, but James 'Bonecrusher' Smith held a business degree from Shaw University in Raleigh. He was the first boxer with a degree to hold a HW title. Calvin Brock has a degree in finance from the University of North Carolina.
Calvin Brock has a college degree. Juan Diaz is in his junior year of college. Chaz Witherspoon has a degree. Joe Mesi I believe has or is near completion of his bachelors. Former pros Palomino has a degree and Willie Dewitt is a criminal defense lawyer in Canada.
I was going to say these two - but you beat me to it and added some others. The Peterson Brothers may be in school too - not sure.