That Hollow Feeling Apr, 2009 By Milan Vatovec, Ph.D., P.E., Paul Kelley, P.E. and Gustavo Tumialan, Ph.D., P.E. In Articles, Structural Practices This article is currently only available in PDF format, please click the link to the top right. About the author ⁄ Milan Vatovec, Ph.D., P.E.Milan Vatovec is Consulting Principal at Simpson, Gumpertz & Heger, Inc. (mvatovec@sgh.com) Prev Integrated Project Delivery Using BIM Next Missed Opportunities in Structural Sustainability