Professor Sussman specializes in the study of Complex, Large-Scale, Interconnected, Open, Sociotechnical (CLIOS) Systems and he has developed the CLIOS Process to study such systems. He has focused recently on developing a new methodology for regional strategic transportation planning, integrating ideas from strategic management, scenario-building, and technology architectures, and applying it to cases in the U.S. and abroad. Currently his work in the CLIOS area deals with transportation, technology and sustainability in Mexico City; Kuala Lumpur, Malaysia; and Portugal. Professor Sussman also has worked extensively on Intelligent Transportation Systems (ITS), helping to build the U.S. national program and develop an “intelligent corridor” in Bangkok. He has developed a comparison of ITS programs in Western Europe, Japan and the U.S. and helped develop regional ITS architectures in the U.S. His research in both freight and passenger railroads focuses on service reliability, rail operations, maintenance, high-speed rail, and risk assessment.