David Richardson, M.D., a distinguished Kentucky-based surgeon who owned and bred Thoroughbreds for nearly half a century and was known as a thoughtful, cerebral racing regulator whose zeal for the sport shone through in his volunteer service on numerous industry-related boards, died Sept. 7 in Saratoga Springs, New York, after developing pneumonia related to COVID-19. Richardson had been briefly hospitalized in the intensive care unit at Saratoga Hospital; he was believed to be 76 years old. Chauncey Morris, the executive director of the Kentucky Thoroughbred Association and Kentucky Thoroughbred Owners...