Greg Harbut's mission to make horse racing more diverse has taken take him back to the classroom. Starting in January, he began a lecture series as part of an entrepreneur residency program at Wilberforce University in which he delivers the message to the students at the historically Black university that getting involved in racing can be a terrific career opportunity. It's his latest attempt to help racing solve what is clearly a problem--its lack of diversity. "It's a wonderful industry, an industry I hold near to my heart and an...