Jim J. Zhao, P.E., is Chief Bridge Engineer with Nolan Associates, Inc., where he is in charge of bridge design and overall project management. He is experienced in design, teaching, and research in structural engineering and serves on the ASCE-ACI joint committees on Concrete Bridge Design and on Prestressed Concrete Design. Mr. Zhao is also the president of the Structural Engineering Institute, ASCE Maryland Chapter. He is the author of two books on bridge design and one on risk management.Demetrius Tonias, P.E., is an award-winning author of numerous works on civil and transportation engineering. As a member of the Adjunct Engineering Faculty of Union College, he taught a variety of courses, including Bridge and Highway Engineering, Infrastructure Management Systems, and refresher courses for the E.I.T. and PE professional licensing examinations. Mr. Tonias is an accomplished software developer with extensive experience in the development of civil engineering computer applications.