Thornton Tomasetti

Thornton Tomasetti (formerly The Thornton-Tomasetti Group, Thornton Tomasetti Engineers, LZA Technology) is an American 1,200+ person structural engineering consulting firm headquartered in New York City. Founded in 1956 as Lev Zetlin & Associates, the 50-year-old company has office locations throughout the world.

The company has expertise in structural engineering, façade engineering, forensics, renewal, construction engineering, property loss consulting, sustainability, applied science, protective design and transportation. The engineering firm provided the structural design for several of the world's tallest building structures, including the Petronas Towers in Kuala Lumpur, Malaysia; and Taipei 101 in Taiwan. Other structures designed by the firm include Soldier Field in Chicago, Petco Park in San Diego, and the Minneapolis Public Library in Minneapolis. Among other architects of note, Thornton Tomasetti has collaborated with Cesar Pelli, Santiago Calatrava, Renzo Piano, and Rafael Vinoly.

Thornton Tomasetti works to advance sustainable design and construction practices. About one-fifth of its staff are LEED accredited professionals (LEED AP). Thornton Tomasetti was the first structural engineering company to sign the AIA 2030 Commitment.

The company began using the name Thornton Tomasetti in 1975 when Charlie Thornton and Richard Tomasetti purchased Lev Zetlin & Associates (LZA) from Gable Industries, to which Lev Zetlin had sold LZA in 1971. Thornton Tomasetti immediately began to branch out and enter the highrise market with several innovative designs.

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