Kersten Weber Tatarelis, PharmD, MBA, BCPS, FASHP, FACHE, is a nationally recognized pharmacy executive and Senior Vice President of Pharmacy Spend Management at Vizient where she currently leads Vizient's pharmacy delivery organization, providing strategic direction for the largest members through sourcing, analytics, consulting, and other pharmacy solutions. Kersten's fpcus is on strengthening executive relationships, developing leaders, driving operational excellence, and ensuring consistent, high-impact value delivery.

Kersten brings more than 20 years of enterprise clinical and operational leadership. She previously served as Vice President of Enterprise Clinical Operations for Advocate Health, the nation’s third-largest nonprofit health system, where she oversaw pharmacy clinical operations across 69 hospitals, guided governance for $3B in pharmaceutical spend, and led large-scale integration, virtual clinical services expansion, and multimillion-dollar system synergy initiatives.

Kersten specializes in innovative pharmacy strategy including enterprise governance, high-reliability clinical operations, operational strategy, 340b optimization, and specialty pharmacy growth. She is known for transforming pharmacy from a cost center into a strategic growth engine. Kersten currently leads teams to support She lives in Wilmette, Illinois, with her husband and four children.