Deep Foundations Jun, 2004 By Gary Seider, P.E. In Feature Helical Foundations… What an Engineer Needs to Know This article is currently only available in PDF format, please click the link to the top right. About the author ⁄ Gary Seider, P.E.Gary L. Seider is an Engineering Manager of CHANCE® Civil and Utility Helical Products. Prev Alternatives to ACI 318-02 Next Liquefaction Basics