Sean O’Brien

Senior Principal, Simpson Gumpertz & Heger

Sean O’Brien is a senior principal and head of the Building Technology group in the NYC office of Simpson Gumpertz & Heger Inc., a national design and consulting firm specializing in buildings and building enclosures. Mr. O’Brien specializes in building science and building envelope performance, including computer simulation of heat, air, moisture migration, and energy efficiency issues. Sean has investigated and designed repairs for a wide variety of building types and has published papers on topics including moisture migration in masonry wall systems and condensation resistance of windows and curtain walls. He holds bachelors and masters degrees in mechanical engineering from Cornell University and is a licensed professional engineer in 17 states. He is a member of ASHRAE, the New York Chapter of the AIA, and co-chair of the New York City Building Enclosure Council.