His primary research area is case-based reasoning, in which he has over 50 publications including the book "Case-Based Reasoning: Experiences, Lessons, and Future Directions" (AAAI Press, 1996). He chaired the AAAI-93 Workshop on Case-Based Reasoning, presented the opening tutorial at the First International Conference on Case-Based Reasoning in 1995, and is co-chair of the 1997 Second International Conference on Case-Based Reasoning. He received his Ph.D. in Computer Science from Yale University.