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Our People

John Peronto

S.E., P.E., CEng, EUR ING, FIStructE, FICE, F.ASCE, SECB, LEED AP Senior Principal & Chicago Co-Office Director


John Peronto is a Chicago co-office director and a leader in our Structural Engineering practice. Since joining Thornton Tomasetti in 2004, he has designed a variety of building types, including commercial, residential, cultural and aviation facilities. His broad expertise encompasses everything from long-span structures to megatall buildings like Saudi Arabia’s 1-kilometer Jeddah Tower, which upon completion will be the tallest building in the world, and the use of innovative materials such as timber. He applies his knowledge in mechanical engineering, material science and fatigue behavior to projects, such as the award-winning TILT at 360 CHICAGO at the John Hancock Center, a mechanized steel-and-glass structure for which John is a patent inventor. John contributes to the development of the engineering profession by taking on leadership roles on technical committees in organizations such as the Structural Engineering Institute of ASCE, the Council on Tall Buildings and Urban Habitat and through representing Thornton Tomasetti on the Chicago Committee on High Rise Buildings.


M.Eng., Civil Engineering, Cornell University

M.S., Civil Engineering, Marquette University

B.S., Civil Engineering, Marquette University

B.S., Mechanical Engineering, Marquette University

John enjoys passing on his experience and knowledge to the next generation of engineers through teaching and giving guest lectures.