Gayle S.  Johnson is a Senior Principal with Simpson Gumpertz & Heger (SGH), with more than 38 years of experience as a project engineer, project manager, and engineering manager. He has spent the majority of his career working on offshore platforms, piers and wharves, and oil and gas facilities, with a particular emphasis on seismic evaluation and design.

In addition to project experience, he has been very active in code writing activities and criteria development. He is Chairman of ASCE 61, the Standards Committee on Seismic Design of Piers and Wharves and was the Committee Chairman and primary editor for ASCE's Guidelines for Seismic Evaluation and Design of Petrochemical Facilities . He is also the U.S. delegate to the PIANC Working Group 153 on Design of Marine Oil Terminals.

He has investigated the performance of industrial and marine facilities in more than twenty earthquakes throughout the world. Following the 1999 M7.4 Turkey earthquake, he was appointed to the FEMA and National Science Foundation sponsored U.S. investigative team as Lead Investigator for industrial facilities, spending 10 days in Turkey immediately following the earthquake, visiting more than twenty five industrial facilities to document damage and facility performance.

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