Dr. Lehmann is Professor for Pediatrics and Biomedical Informatics at Vanderbilt University. He conceived and launched the journal Applied Medical Informatics, devoted to original research and commentary on the use of computer automation in the day-to-day practice of medicine and he served as the Editor-in-Chief since its inception. In 2009, he co-edited Pediatric Informatics, the first textbook on this subject.
Dr. Lehmann has served on the board of the American Medical Informatics Association since 2008 and currently serves as the organizations secretary. In 2010, he was inducted as a fellow into the American College of Medical Informatics and in 2012 he became a Vice President of the International Medical Informatics Association in 2012 in charge of the IMIA Yearbook.
In 2010, Dr. Lehmann was appointed Medical Director of the Child Health Informatics Center for the American Academy of Pediatrics. Dr. Lehmann serves on the Examination Committee of the American Board of Preventive Medicine, Subcommittee for Clinical Informatics.