Structural Upgrade of Sutro Tower Jan, 2005 By Ronald O. Hamburger, S.E. SECB In Articles, Lessons Learned San Francisco, California This article is currently only available in PDF format, please click the link to the top right. About the author ⁄ Ronald O. Hamburger, S.E. SECBRonald O. Hamburger (rohamburger@sgh.com) is a senior principal at Simpson Gumpertz & Heger in San Francisco. Prev Light at the End of the Tunnel Next Sustainability and the Role of the Structural Engineer