William J. Mastellon has joined KSL Media in New York as senior vice president, chief financial officer, and Tarun Chachra has become vice president, chief technology officer. Former president, U.S. operations, at Firm Decisions, Mastellon was the longtime CFO at DeWitt Media and then Optimedia International. Earlier in his career, he worked on the client side, for CPC International and General Foods. Chachra arrives at KSL from Publicis Worldwide, where he was vice president, IT director. Before that, he was MIS director at DeWitt Media.