Thornton Tomasetti is a leader in engineering, design, investigation, and analysis. We collaborate with clients who seek sustainable design strategies, innovative ideas and integrative thinking to create high performance green buildings. We use whole-systems thinking to strike the right balance on each project between economic, social and environmental factors. We have more than 160 LEED-accredited professionals on staff with collective expertise that encompasses LEED projects at all levels of certification and types of LEED rating systems, and LEED for Homes Provider Services.