Siteman Cancer Center’s cutting-edge facilities and nationally renowned staff would be nothing without the people who lead them. Our leadership team is comprised of doctors, some of whom have been with Siteman since its inception in 1999, who are committed to serving as a resource through every phase of the cancer journey.

Senior Leadership Committee

Timothy Eberlein, MD

John DiPersio, MD, PhD
Deputy Director

Graham Colditz, MD, DrPH
Associate Director, Prevention and Control

Bettina Drake, PHD, MPH
Associate Director, Community Outreach & Engagement

Nick Fisher, MBA
Executive Director of Research & Business Administration

Jeff Michalski, MD, MBA
Medical Director, Clinical Trials

Lee Ratner, MD, PhD
Associate Director, Education and Training

Karen Seibert, PhD
Associate Director, Shared Resources

Sheila Stewart, PhD
Associate Director, Basic Science

Senior Leaders at Large

Sam Achilefu, PhD
Co-Leader: Oncologic Imaging Program

Farrokh Dehdashti, MD
Co-Leader: Oncologic Imaging Program

Dennis Hallahan, MD
Professor and Chair of Radiation Oncology

William Hawkins, MD
PI – Pancreatic SPORE

Daniel Link, MD
Co-Leader: Hematopoietic Development & Malignancy Program; PI – Leukemia SPORE

Christina Longnecker, JD, MBA, BSN, RN
Vice President of Oncology Services

Jeffrey Milbrandt, MD, PhD
Executive Director, McDonnell Genome Institute at Washington University

Philip Payne, PhD
Director, Institute for Informatics