His research interests are in developing methods and tools for environmental and economic analysis of civil infrastructure systems, primarily for the built environment. His research has focused on the environmental implications of the construction, electronics and various service industries, life-cycle assessment modeling by using environmentally augmented economic input-output analysis, and environmental performance measurement. He is the director of the Consortium on Green Design and Manufacturing, which encourages multidisciplinary research and education on environment and pollution prevention issues. He is also associate editor of the Journal of Infrastructure Systems. He received his Ph.D. in Civil Engineering from Carnegie Mellon University.