Jonathan Kantar, Founder and Principal Jonathan’s more than 25 years in the construction field include project management, client services, real estate development and computer-systems design. Prior to founding Sage Builders, he owned and managed a Boston-area residential and light-commercial construction company. A Newton native and resident, Jonathan serves as chair of Newton’s High Performance Building Coalition, and is a member of Newton’s Design Review Committee and Energy Commission. He is a board member for Historic Newton, where he chairs the Buildings and Grounds Committee, and is an active volunteer in a wide variety of community projects and programs. Jonathan serves on the Governor’s Zero Net Energy Buildings Advisory Council, and works to help communities adopt sustainable and energy efficiency practices. He is a graduate of the University of Michigan and is currently pursuing a Master’s degree in sustainable design and construction through the Boston Architectural Center. Jonathan enjoys cycling, playing tennis and hockey, and skiing both on snow and water.