John Crigler, P.E. is Senior Vice President and Technical Manager of VStructural LLC (VSL). For more than 29 years, he has held various positions including Project Manager, Division/Chief Engineer, National Manager of Bridges, and Marketing Manager. He possesses extensive knowledge of the design and construction of prestressed concrete structures including bridges, buildings, tanks, and silos. Crigler serves as the Secretary/Treasurer of the American Segmental Bridge Institute (ASBI). He also serves on the Post-Tensioning Institute (PTI) Technical Activities Board (TAB). In addition, he is a member of the American Concrete Institute and the American Society of Civil Engineers. Crigler earned a B.S. degree in Civil Engineering from Virginia Tech.