Dr. Lehman's clinical and research expertise brought numerous best practices and techniques to the discipline of ERCP. Thanks to his efforts and the mentorship he provided, IU became the most prominent and prolific center for advanced endoscopy in North America over the course of three subsequent decades.

For over 30 years, Dr. Lehman heavily involved himself in training and teaching fellows, including those from more than 15 countries worldwide. His academic legacy includes numerous high-profile publications, book chapters, and hundreds of invited talks and presentations in the U.S. and internationally. He has received several distinguished awards, notably the Rudolf Schindler Award, the most prestigious awards presented by the American Society for Gastrointestinal Endoscopy.