Welcome to ATD-VOS. The mission of the Valley of the Sun chapter of ATD is to advance the workplace learning and performance interest of our members. ATD VOS was chartered in 1959 and is a local chapter of the Association for Talent Development (ATD). It is a professional organization dedicated to the growth and development of its members in a supportive learning environment contributing to their business success. We strive to provide quality professional development programs in the workplace learning and performance development disciplines. We also deliberately foster opportunities for networking among professionals, collaboration with businesses and organizations and the exchange of best practices solutions and information.