Dr. Leonard is a pharmacoepidemiologist with expertise in post-market drug safety. He is internationally known for his work in the comparative safety of medical products, especially among economically disadvantaged and older adult populations. He has presented his work in this area to: field leaders at national and international conferences; federal regulators and policymakers at FDA, AHRQ, and CDC; colleagues at universities and institutions at home and abroad; and to clinical decision support stakeholders at health information technology firms.