Xchange, the relationship-marketing unit of CommonHealth, has hired John Clark as EVP, managing director. Most recently, Clark developed professional and consumer CRM programs at GSW Worldwide. Charles Di Stefano comes to Xchange as VP, account director. Before this, Di Stefano served as management supervisor at Rapp Collins Worldwide. Janice Furie will serve as account supervisor. Furie was previously a marketing manager at Pfizer. Joann Rude has been promoted from business manager to senior business manager. Rude has been with Xchange for more than two years.