Stakes coordinator David Rollinson will be leaving the Maryland Jockey Club to concentrate on his bloodstock business specializing in acquiring and managing European Thoroughbreds for American racing. Rollinson, who worked at Pimlico and Laurel Park for 10 years, relocated to the United States from Ireland in 1988. He is leaving at the end of September."It was a great experience, especially being a part of the Preakness," said Rollinson. "There was an immense amount of excitement generated by the Triple Crown and the other graded races we had during the year. But it is time for me to seek a new challenge."Wendy Pensivy, who was promoted from within the racing office, will replace Rollinson.