1. Professor at Massachusetts Institute of Technology and director, Physics Research Laboatory, Massachusetts General Hospital, Boston 02114
2. Henry Miller professor of medical research, Donner Laboratory and Department of Electrical Engineering and Computer Sciences, University of Calforlia, Berkeley 94720
3. Professor in the Department of Chemistry and research professor in the Department of Radiology, State University of New York, Stony Brook 11794
4. Professor in the Department of Neuroscience, Unviersity of British Columbia, Vancouver, British Columbia, Canada V6T 1W5