A pioneer of Semantic Web research, he wrote the first PhD dissertation on the subject and, with James Hendler and Sean Luke, created SHOE. Heflin is a member of the committee that designed DAML+OIL and an invited expert to the W3C Web Ontology working group. His recent research interests include using ontologies to integrate heterogeneous systems, building scalable Semantic Web systems, and developing theories of distributed ontology systems. Contact him at heflin@cse.lehigh.edu.