Walker Hancock

Chef Bobby Flay takes over the interviewing duties this week when he hosts Sol Kumin in his Manhattan studios. Kumin, the 41-year-old hedge fund manager, has been involved in horse racing for just over two years, enjoying unprecedented success. But most of all, he’s having the time of his life.

Always a top trainer, Mark Casse has emerged as one of the major forces in racing this year. He has continued to dominate Canadian racing, he took Tepin over to Royal Ascot to win the Grade I Queen Anne Stakes and he won the Grade I Breeders’ Cup Juvenile with Classic Empire, next year’s Derby...