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Ray Sirjani graduated in Civil Engineering in 1979 from the State University of  Texas, USA. Later  he  received his Masters degree in Structural Engineering from the Engineering Academy of Denmark. He worked as a structural designer from the start; specializing in pre-engineered industrial steel rigid frames. In 1982 he started TSH Construction company, with 7other engineer associates, working in design-build projects. In 1992, he became partner with his brother in Faradid Consulting Engineers, and  worked as the head of the bridge design department. In that period he designed many bridges, tunnels, retaining walls, culverts and other road related structures. He started his structural design company in 1998 later named as Sirjani Engineering Inc., during which he has designed many Industrial, Commercial and Residential structures which can be found in the project list.

Ray Sirjani designed the foundations of the Pearson International Airport Terminal development project while working with Yolles.