Hartley/De Renzo Thoroughbreds has hired Rebecca Hayden as its bloodstock consultant and director of stallions. Hayden, 32, will focus on recruiting new stallions and promoting the operation’s stallion roster.... International Sound Corporation , which provides broadcast production services to more than 50 racetracks, has acquiredTeleview Racing Patrol, Inc., a Florida-based company specializing in broadcast television production, photo finish, and timing systems to nearly 50 tracks.