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Thornton Tomasetti employees gather at a Spectrum Pride event in the office.
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R&D and technology play an essential role in our firm. We invest in constant learning, testing and innovation. That uniquely positions us to solve our clients’ most difficult problems.
Innovation Engine Our CORE groups manage our research and development efforts, from incremental efficiency improvements to solving some of the most challenging engineering problems of our time. Learn More
Innovation Output We believe collaboration amplifies our innovation potential and creates connections that lead to better, more imaginative solutions for our clients. Learn More
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Our People

Stephen Pessiki Ph.D.

Senior Vice President

Our People

Stephen Pessiki Ph.D.

Senior Vice President

Stephen Pessiki is a senior vice president in our Forensics practice.
Education

Ph.D., Civil and Environmental Engineering, Cornell University
M.S., Civil and Environmental Engineering, Cornell University
B.S., Civil Engineering, Drexel University