Developed a special mechanized retrieval system at Lehigh; Creator of the Leadersmart System, the most powerful text retrieval system of its time (late 60s, early 70s); worked on early computer-based bibliographic record systems (LEADER, LEADERMART) at Lehigh University with National Science Foundation support; also did early studies on logic and linguistics; innovative online system LEADER– ahead of his time in the theoretical development– see Bellardo and Bourne draft (Bellardo); in last few years has not been doing much IR work but is still active in such areas as databases, expert systems, hypermedia, etc.