He had his own partnership, Grassi-Tullis architects for 7 years, worked on urban design and institutional projects at Koetter Kim & Associates for 5 years and designed laboratory and educational buildings at Ellenzweig Associates for 5 years. He was most recently a Vice President at Elkus-Manfredi Architects, and after 13 years at New England's largest architectural firm he migrated to real estate development in 2008. As Vice President and Director of Design at the General Investment & Development Companies, he oversees all design aspects of the Development Group's multifamily and mixed-use projects.