How do we know we're making the right treatment decision for the right patient at the right time? In this episode of She Leads Science, Dr. Liz Joy sits down with pioneering pharmacotherapy researcher Diana Brixner, RPh, PhD, to explore the science behind medication effectiveness, value, and real-world impact. Dr. Brixner reflects on a remarkable career spanning industry, academia, health systems, and policy, sharing how pharmacotherapy outcomes research has transformed the way clinicians, payers, and policymakers evaluate medications. Together, they discuss the promise and challenges of GLP-1 receptor agonists, the evolution of precision medicine, the future of pharmacogenomics, and whether science is approaching meaningful breakthroughs in Alzheimer's disease. Beyond her research, Dr. Brixner shares lessons learned from building the Pharmacotherapy Outcomes Research Center, mentoring generations of scientists, and leading national organizations. This thoughtful conversation highlights how rigorous science, interdisciplinary collaboration, and visionary leadership can improve healthcare decisions - and ultimately improve patients' lives.