Dr. Siegel serves on the Nanotechnology Technical Advisory Group of the President's Council of Advisors on Science and Technology. He has also chaired the World Technology Evaluation Center worldwide study of nanostructure science and technology that led to the U.S. National Nanotechnology Initiative. He is the past chairman of the International Committee on Nanostructured Materials and earlier served on the U.S. National Materials Advisory Board Committee on Materials with Submicron-Sized Microstructures. He was the co-chairman of the Study Panel on Clusters and Cluster-Assembled Materials for the U.S. Department of Energy.
Siegel was on the faculty of the State University of New York at Stony Brook from 1966 to 1976 and at Argonne National Laboratory from 1974 to 1995. He has been at Rensselaer since 1995, serving as Department Head of Materials Science and Engineering from 1995 to 2000. He has authored more than 260 publications and numerous patents (11 issued, 7 pending) in the areas of defects