SUNY Stony Brook, BS RPI) with over 25 years of experience with ontological analysis growing out of his dissertation on knowledge representation for discourse understanding. He has taught human learning and cognition & problems solving courses at the University of Delaware, GW & GMU. Since 1975 he has consulted to health and medical organizations on medical inforamtics to improveme medical functioning and manage medical knowledge. Major thrusts of work includes reusable medical knowledge, vocabularies and semantic interoperability. He has participated in several IT & of Health Informatics efforts to standardize medical concepts and more recently in efforts to enable R& D collaboration of geospatial semantics and related ontologies. (1PS4)