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Faculty Bios

The interdisciplinary Medical Physics Programs provide students pursuing their medical physics studies with the opportunity to work closely with faculty in the departments of Radiology, Bioengineering and Radiation Oncology. Faculty members also provide students with both research and practicum opportunities.

The following professors currently teach courses in the Medical Physics Programs:

From the Department of Radiation Oncology

  • Acting Director, Medical Physics Programs
    Assistant Professor of Radiation Oncology, Department of Radiation Oncology, University of Pennsylvania
    Fellow, American Association of Physicists in Medicine

    Dr. Avery is certified by the American Board of Radiology. He holds a BS in Physics from Millersville University and an MS and PhD in Experimental Nuclear Physics from Hampton University. Dr. Avery coordinates/teaches MMP 506: Physics of Radiation Therapy and MMP 507: Physics of Medical/Molecular Imaging.

  • Assistant Professor of Radiation Oncology, Department of Radiation Oncology, University of Pennsylvania

    Dr. Ainsley is board certified by the American Board of Radiology. He earned a BA and MA in Natural Sciences; an MS in Experimental & Theoretical Physics; and a PhD in Experimental Particle Physics from University of Cambridge, United Kingdom. Dr. Ainsley’s research focuses on the accurate implementation of proton therapy. He teaches MMP 506: Physics of Radiation Therapy.

  • Assistant Professor of Radiation Oncology, Department of Radiation Oncology, University of Pennsylvania

    Dr. Alejandro Carabe-Fernandez is certified by the Institute of Physics and Engineering in Medicine, United Kingdom (UK). He earned an MPhys in Physics with Medical Technology from University of Hull, UK and an MSc in Medical Physics from University of Glasgow, UK. He holds a PhD in Radiobiology from Imperial College, UK. Dr. Carabe-Fernandez’s research focuses on clinical and theoretical radiobiology; high-linear energy transfer (LET) radiobiology and radiotherapy; radiobiological optimization; tumor control probability (TCP)/normal tissue complication probability (NTCP) specific for high LET radiations; repair kinetics modeling; and proton arc therapy. He serves as the chair of the program’s Research Committee and as an advisor for students’ capstone research projects. Dr. Carabe-Fernandez teaches MMP 506: Physics of Radiation Therapy.

  • Assistant Professor of Radiation Oncology, Department of Radiation Oncology, University of Pennsylvania

    Dr. Diffenderfer earned a BS in Physics from The Evergreen State College, and an MS in Physics and PhD in Nuclear Physics from Florida State University. He is board certified by the American Board of Radiology. Dr. Diffenderfer’s research interests center on proton therapy physics and radiation physics for biological systems. He teaches MMP 501: Introduction to Radiation Protection and MMP 502: Medical Ethics/Governmental Regulation. 

  • Vice Chair and Director of the Medical Physics Division, Department of Radiation Oncology, University of Pennsylvania
    Professor of Radiation Oncology, Department of Radiation Oncology, University of Pennsylvania

    Dr. Lei Dong is certified by the American Board of Radiology. He holds a BS in Engineering Physics and an MS in Modern Applied Physics from Tsinghua University, China. He earned a PhD in Biomedical Science/Medical Physics from the University of Texas Health Science Center at Houston. A nationally recognized expert in radiation therapy, Dr. Dong has co-authored more than 170 peer-reviewed articles and 14 book chapters. He has conducted innovative research and clinical development in image-guided radiation therapy and proton therapy. Many of his research and developmental work have been translated into clinical practice. Dr. Dong is the chair of the program’s Faculty Advisory Committee.

  • Associate Professor of Clinical Radiation Oncology, Department of Radiation Oncology, University of Pennsylvania

    Dr. Levin earned a BA in Psychbiology from Franklin and Marshall College, an MS in Physiology from Georgetown University and an MD from the Sackler School of Medicine, Israel. He is board certified by the American Board of Radiology. Dr. Levin’s research focuses on the treatment of sarcoma and thoracic malignancies. He teaches MMP 511: Image-Based Anatomy. 

  • Assistant Professor of Radiation Oncology, Department of Radiation Oncology, University of Pennsylvania

    Dr. Lin holds an MS in Applied Physics from Shanghai Jiaotong University, China, and an MS and PhD in Medical Physics from University of Wisconsin-Madison. He is board certified by the American Board of Radiology. Dr. Lin’s research interests include development of fast Monte Carlo dose calculation/plan adaptation to model and mitigate beam line and motion and imaging uncertainties in pencil beam scanning proton therapy. He teaches MMP 506: Physics of Radiation Therapy. 

  • Adjunct Assistant Professor of Radiation Oncology, Department of Radiation Oncology, University of Pennsylvania

    Dr. Mooij earned a BS in Physics; an MS in Experimental Physics; and PhD in Nuclear Physics from Universitiy of Amsterdam, The Netherlands and an MS in Computer Science from Drexel University. Dr. Mooij teaches MMP 506: Physics of Radiation Therapy.

  • Assistant Professor of Radiation Oncology, Department of Radiation Oncology, University of Pennsylvania
    Medical Physicist, Department of Radiation Oncology, Hospital of the University of Pennsylvania
    Associate Director, Medical Physics Residency Program, Department of Radiation Oncology, Hospital of the University of Pennsylvania

    Dr. Teo is certified by the American Board of Radiology. He holds a PhD in Physics from the University of Michigan. Dr. Teo’s research interest is in the development of imaging techniques for use in radiation therapy. He teaches MMP 506: Physics of Radiation Therapy. 

  • Senior Research Investigator of Radiation Oncology, University of Pennsylvania School of Medicine

    Dr. Tuttle’s research focuses on the role of primary metabolic pathways and thiols in the cellular response to radiation response modifiers. Dr. Tuttle holds a BS in Biology from Muskingum College, an MS in Genetic Toxicology from Case Western Reserve University, and a PhD in Biochemistry from the University of Pennsylvania. Dr. Tuttle teaches MMP 512: Radiation Biology.

  • Professor of Radiation Oncology, Department of Radiation Oncology, University of Pennsylvania

    Dr. Ying Xiao earned a BS in Optical Engineering from Tsinghua University, China. She holds an MS and PhD in Physics from Temple University, and she is certified by the American Board of Radiology. Dr. Xiao’s research focuses on the quality assurance of imaging and radiotherapy. She serves on the Faculty Advisory Committee and as an advisor for students’ capstone research projects.

  • Professor of Radiation Oncology, University of Pennsylvania School of Medicine

    Dr. Zhu is certified by the American Board of Radiology in Radiation Oncology Physics. Dr. Zhu holds a BS in Electronic Engineering from Fudan University, China, and an MS in Physics, MS in Engineering and a PhD in Physics from Brown University. His research interests include external beam photon radiation transport, photodynamic therapy physics, in vivo diode dosimetry and real time dose calculation for IGRT. Dr. Zhu teaches MMP 506: Physics of Radiation Therapy. 

From the Department of Radiology

  • Associate Professor of Radiology, Hospital of the University of Pennsylvania
    Chief, Physics Section, Department of Radiology, University of Pennsylvania

    Dr. Maidment is certified by the American Board of Radiology in Diagnostic Physics. He holds a BASc in Engineering Science from the University of Toronto and a PhD in Medical Biophysics from the University of Toronto. Dr. Maidment teaches MMP 507: Physics of Medical/Molecular Imaging. 

  • Associate Professor, Department of Bioengineering
    Assistant Professor of Radiology in Bioengineering, Department of Radiology, University of Pennsylvania

    Dr. Tsourkas is an active member of the Institute for Medicine and Engineering (IME) and the Institute for Translational Medicine and Therapeutics (ITMAT), both at the University of Pennsylvania. He holds a BS in Mechanical Engineering from Cornell University, an MS in Mechanical Engineering from The Johns Hopkins University and a PhD in Biomedical Engineering through a joint program at the Georgia Institute of Technology and Emory University. Dr. Tsourkas coordinates and teaches MMP507: Medical/Molecular Imaging.

Hospital affiliations

Program Resources

Penn's Medical Physics Programs work in collaboration with area hospitals to offer additional practicum experiences and hands-on medical physics training. 

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