Company patriarch Donald Sullivan has been working with his sons Dennis and Mark since they were young. He has been at DAS since 1955 and has been involved with countless projects throughout the area; recently the firm returned to Westfield State University to update two buildings whose construction Donald was involved with many years ago, the Ely Library and the Campus Center.

A licensed construction supervisor, he holds a Bachelor of Arts Degree in Business Management from the University of Notre Dame, and has a deep understanding of the company’s experience and history.