The Advanced National Seismic System Jun, 2007 By William Leith, Ph.D. In Articles, InSights Structural Monitoring To Improve Understanding of Seismic Performance This article is currently only available in PDF format, please click the link to the top right. About the author ⁄ William Leith, Ph.D.William Leith, Ph.D., is Program Coordinator for ANSS within the U.S. Geological Survey. For more information on ANSS visit www.anss.org. Prev Global Partnerships Next Biodegradation of Untreated Wood Foundation Piles In Existing Buildings – Part 1