Faculty Members

Lisa Riehle, MS, CNMT
Program Director 
School of Nuclear Medicine
Northwestern Memorial Hospital
lriehle@nm.org    

Michelle Gruchot, BS, CNMT, PET, RT (CT)
Clinical Coordinator 
School of Nuclear Medicine
Northwestern Memorial Hospital
michelle.gruchot@nm.org

​Gary L Dillehay, MD, FACNP, FACR
Professor of Radiology
Department of Nuclear Medicine
Medical Director of Nuclear Medicine
Northwestern Memorial Hospital
g-dillehay@northwestern.edu

William G. Spies, MD
Professor of Radiology
Department of Nuclear Medicine
Northwestern Memorial Hospital
wspies@northwestern.edu

Stewart M. Spies, MD
Professor of Radiology
Northwestern University Feinberg School of Medicine
Northwestern Memorial Hospital
sspies@northwestern.edu

Scott M. Leonard, MS, CNMT
Medical Physicist IV
Imaging Informatics
Northwestern Memorial Hospital
sleonard@nm.org

​Tim Houston, PharmD
Nuclear Pharmacist
Department of Nuclear Medicine
Northwestern Memorial Hospital
timothy.houston@nm.org

Jennifer Gersman, MHA, CNMT
Radiation Safety Officer
Northwestern Memorial Hospital
jennifer.gersman@nm.org

Heather Mallett, MBA, RT (T)
Program Director
School of Radiation Therapy
Northwestern Memorial Hospital
heather.mallett@nm.org

Tatjana Paunesku, PhD
Research Assistant Professor
Dept. Radiology, Feinberg School of Medicine
Northwestern University
tpaunesku@northwestern.edu

Gayle E. Woloschak, PhD
Research Professor
Departments of Radiation Oncology, Radiology and Cell and Molecular Biology
Northwestern University Feinberg School of Medicine
g-woloschak@northwestern.edu

Alex Zafirovski, MBA, R.T.(T)
Executive Director
Lurie Cancer Center
Northwestern University
alex.zafirovski@northwestern.edu

Lyndsi Hay, BS, CNMT
Resource Coordinator and Clinical Supervisor
Northwestern Memorial Hospital
lyndsi.hay@nm.org

Indriani Dermawan, BS, CNMT
Senior Nuclear Medicine Technologist
Northwestern Memorial Hospital
idermawa@nm.org

Bernie McKay, BS, CNMT
Nuclear Radiopharmacy Specialist
Northwestern Memorial Hospital
bernard.mckay@nm.org