Thornton Tomasetti provides building engineering services to clients worldwide on projects of all sizes and complexity. From the tallest towers and the longest spans, to innovative building systems and materials, we are committed to creating the best solutions through our technical ingenuity, our pursuit of excellence, and responsiveness to client needs. Founded in 1956 as Lev Zetlin & Associates, today we are a +650-person organization of engineers and architects, collaborating from offices across the United States and in Hong Kong, London, Moscow, and Shanghai. Our services cover structural design, building evaluation, and remediation to optimize building efficiency and performance. We mobilize rapidly to provide disaster response investigations, and deliver expert consulting services and testimony for legal and insurance purposes.