Our Residents & Fellows

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Memorial Sloan Kettering's radiation oncology residents and fellows.

Memorial Sloan Kettering's radiation oncology residents and fellows.

Our residents come from diverse educational and personal backgrounds, but all share a passion for radiation oncology clinical practice and research. We are also fortunate to have two fellows as part of our department, specializing in brachytherapy and protons.

We work and learn together — in a single residents’ room — and consider the camaraderie of the residents and fellows one of the major strengths of our residency program.

First-Year Residents (July 2019 – June 2023)

Morgan Freret

Morgan Freret
Born and raised in Northern California, I majored in biology at Stanford University. My interest in medicine developed after I joined a Stanford biochemistry laboratory that was investigating a signaling pathway important in the pathogenesis of a type of pediatric brain tumor. I completed my MD/PhD training at Harvard Medical School. My PhD research characterized molecular and functional subtypes of brain serotonergic neurons in mice. I joined the Radiation Oncology Residency Program after my transitional year internship at MSK.


Harper Hubbeling

Harper Hubbeling
I grew up in Austin, Texas, and got my undergraduate degree in biology from Haverford College in Pennsylvania, where I studied patrolling monocyte development. After college I worked at the University of Pennsylvania in an immunology lab investigating how immune cell subsets affect the intestinal microbiome. I then attended Harvard Medical School, where I did clinical research in thoracic oncology with Alice Shaw’s group. I completed a transitional year internship at MSK before joining the Radiation Oncology Residency Program.


Emily Schapira Lebow

Emily Lebow
I grew up in Milwaukee, Wisconsin, and received my undergraduate degree from the University of Pennsylvania. I attended Harvard Medical School, where I spent a year doing clinical research under the mentorship of Helen Shih at Massachusetts General Hospital. I studied the integration of radiation therapy and immunotherapy, with a focus on treating people with cancer that has spread to the brain. I completed a transitional year internship at MSK before joining the Radiation Oncology Residency Program.


Zachary Moore

Zachary Moore
I grew up in Texas and attended the University of Texas at Austin, where I studied biomedical engineering and designed nanoparticles for targeted drug delivery. After completing my undergraduate degree, I went to the University of Texas Southwestern Medical Center in Dallas to complete my MD and PhD. For my doctoral research I studied tumor-targeted DNA-damaging agents and combination treatment strategies for pancreatic cancer and lung cancer. Before joining the Radiation Oncology Residency Program at MSK, I completed a transitional year internship at Scripps Mercy Hospital in San Diego.


Victor Ng

Victor Ng
I was born and raised in San Jose, California, and obtained my bachelor’s degree from the University of California, Berkeley, where I majored in bioengineering. I then developed a significant interest in the pathogenesis and maintenance of cancer while studying leukemia stem cells at the University of California, San Francisco. My studies subsequently brought me to the University of Michigan, where I not only received a master’s degree in biomedical engineering but also learned lifelong lessons on the compassionate care of people with cancer as a hospice volunteer. I traveled to New York for my medical studies at the New York University School of Medicine and then did a transitional year internship at MSK. I am grateful to be continuing my training in the Radiation Oncology Residency Program at MSK.


Kathryn Tringale

Kathryn Tringale
I grew up in the San Francisco Bay Area and attended Brown University, where I received my degree in biomedical engineering. Before attending medical school at the University of California, San Diego, I continued my undergraduate thesis work in brain computer interface clinical trials with the BrainGate group at Massachusetts General Hospital in Boston. Throughout medical school, I was involved in a variety of research endeavors, including cost-effectiveness, clinical trials, and medical ethics. The thesis for my master’s degree in clinical research investigated the use of advanced diffusion imaging techniques as biomarkers for neurocognitive performance in people undergoing brain radiotherapy. Before coming to MSK, I completed my preliminary year internship in internal medicine at Kaiser Permanente in Los Angeles.


Second-Year Residents (July 2018 – June 2022)

Ishita Chen, MD, PhD

Ishita Chen
I grew up in India and got my undergraduate degree in biomedical engineering from the University of Toledo in Ohio. In college I did medical imaging research at the Mayo Clinic. I obtained my PhD in biomedical engineering at Vanderbilt University in Nashville. While there I worked on adapting an atlas-based biomechanical model for a neurosurgical image guidance system. I attended medical school at Washington University in St. Louis, where I continued to work on image guidance in radiation therapy. I completed a preliminary medicine internship at St. Luke’s Hospital in Chesterfield, Missouri, prior to starting the Radiation Oncology Residency Program at MSK.


Xiaojing Huang, MD, PhD

Xiaojing Huang
I was born in Guangzhou, China, and grew up in Utah and New Jersey, where I did my undergraduate degree in chemistry at Princeton University. After college I worked at Massachusetts General Hospital in a cardiac stem cell lab. I then moved to a medical scientist training program at Washington University in St. Louis. I did my graduate work in mass spectrometry–based metabolomics and macrophage metabolism. During my clinical years I extended my metabolomics studies to investigate how cervical cancer cells adapt their metabolic programs when undergoing chemoradiation. I completed my intern year in the internal medicine program at Barnes-Jewish Hospital in St. Louis.


Dillon Li, MD, MPH

Dillon Li
I grew up in Inner Mongolia, China. I attended Peking University in Beijing, where I received my undergraduate degree in biomedical sciences. I then joined Ramanujan Hegde’s lab at the National Institutes of Health to study membrane protein biology as a Student Intramural Research and Training Award recipient. I received an MPH degree from the University of Cincinnati prior to attending medical school at the University of Kentucky College of Medicine. In medical school I joined David Yu’s lab at Emory University in Atlanta and studied DNA damage repair. I was also involved in clinical research evaluating a stereotactic body radiation therapy boost for locally advanced lung cancer. I completed a transitional year internship at Santa Clara Valley Medical Center in California prior to joining the Radiation Oncology Residency Program at MSK.


Achraf Shamseddine, MD, PhD

Achraf Shamseddine
I was born in Lebanon and did my undergraduate studies at the American University of Beirut. I completed my MD/PhD at SUNY Stony Brook. My work focused on the role of sphingolipids in the cellular DNA damage response. It also involved devising strategies to chemosensitize and radiosensitize breast cancer cells through the manipulation of sphingolipid enzymes. I completed a transitional year internship at MSK before joining the Radiation Oncology Residency Program.


Neil Ari Wijetunga, MD, PhD

Neil Ari Wijetunga
I was born in North Dakota, but I grew up mostly outside of Philadelphia. I attended Boston University, where I majored in statistics and became interested in statistical genetics and public health. I then obtained a master’s degree in biostatistics at Columbia University. Afterward I joined the MD/PhD program at Albert Einstein College of Medicine in the Bronx, New York, where I studied the genomic and epigenetic effects of environmental exposures, including oncogenic viral infection and radiation exposure. Before coming to MSK I completed a medical internship at NYU Winthrop Hospital.

Third-Year Residents (July 2017 – June 2021)

Xin Ca
Xin Cai, MD, PhD

I was born in China and grew up in Vancouver, Canada. I completed my undergraduate studies in chemistry and physics at Harvard University, where I also received a master’s degree in chemistry. I then joined the MD/PhD program at UT Southwestern Medical Center, where I studied the mechanism of innate immune and inflammatory signaling as a Howard Hughes Medical Institute fellow under the mentorship of Zhijian Chen. I completed a transitional year internship at MSK prior to joining the Radiation Oncology Residency Program.


Kelly Fitzgerald
Kelly Fitzgerald, MD, PhD

I grew up in Massachusetts and attended Boston College, where I received an undergraduate degree in biochemistry. I then entered the MD/PhD program at Yale School of Medicine. For my doctoral thesis, I designed and tested novel synthetic compounds that targeted prostate cancer for immune destruction. I completed a preliminary medicine internship at Yale New Haven Hospital before joining the Radiation Oncology Residency Program at Memorial Sloan Kettering.


Justin Haseltine
Justin Haseltine, MD

I was born and raised in southwest Missouri. I majored in biomedical engineering at Duke. In college, my interest in research was sparked when I joined a lab focused on seeding human endothelial progenitor cells onto metal vascular implants with the goal of reducing blood clots. While earning my medical degree at Weill Cornell, I spent a year studying DNA damage repair in the lab of Simon Powell here at MSK. I was also fortunate to have the opportunity to spend a month of my medical training with radiation oncologists in India, which afforded me a unique perspective on the global delivery of care. I completed a medical internship at Brown University before joining MSK’s Radiation Oncology Residency Program.


Christopher Johnson
Christopher Johnson, MD, PhD

I grew up in Chesapeake, Virginia, but spent much of my time across the state line in Currituck, North Carolina. After earning a chemistry degree from the University of North Carolina at Chapel Hill, I entered the Medical Scientist Training Program at the Medical University of South Carolina. As an MD/PhD student in David Cole’s lab, I studied the role of cytokines in adoptive T cell therapy. Upon graduation, I completed a transitional year internship at MedStar Harbor Hospital in Baltimore before joining the Radiation Oncology Residency Program at Memorial Sloan Kettering.


Leslie Modlin
Leslie Modlin, MD

I grew up on the North Shore of Chicago and attended Duke University, where I designed a major to explore the biopsychosocial determinants of health and conducted neuro-oncology research. Before medical school at Stanford, I worked on clinical trials evaluating hypofractionated stereotactic radiosurgery for brain tumors under the mentorship of Scott Soltys. As a medical student, I continued my clinical and translational research on circulating tumor DNA as a Radiological Society of North America grant recipient in the lab of Max Diehn. I also led medical student wellness initiatives. I completed my internship at Cambridge Health Alliance of Harvard Medical School before joining the Radiation Oncology Residency Program at Memorial Sloan Kettering.


Mira Patel
Mira Patel, MD

I was born and raised in Rochester, New York, and attended Cornell University, where I received degrees in political science and biological sciences. Subsequently, I completed my medical training at Johns Hopkins University School of Medicine, where I studied tumor immunology in a preclinical model of glioblastoma as a Howard Hughes Medical Institute research fellow. Prior to joining Memorial Sloan Kettering’s Radiation Oncology Residency Program, I completed a categorical internship in otolaryngology-head and neck surgery at Washington University/Barnes-Jewish Hospital in St. Louis.

Fourth-Year Residents (July 2016 – June 2020)

Thomas Beckham
Thomas Beckham, MD, PhD

I grew up in Aiken, SC where I discovered my interest in science and the natural world.  I developed an interest in scientific research particularly as it can be applied to improve human health during my undergraduate studies in Genetics at Clemson University.  I found an amazing training environment as a physician scientist in the Medical University of South Carolina’s Medical Scientist Training Program.  There I completed my MD training and my doctoral research in oncogenic sphingolipid signaling in prostate cancer.  I completed my internship in the Transitional Year program at Memorial Sloan Kettering Cancer Center where I learned a great deal about clinical medicine as well as the unique challenges and rewards of caring for cancer patients. I am excited to be able to continue my training in the Department of Radiation Oncology.


Dana L. Casey
Dana L. Casey, MD

I grew up by the beach in Clearwater, Florida, and received my undergraduate degree at Stanford University, where I studied psychology and mathematics. I then went to medical school at the Icahn School of Medicine at Mount Sinai in New York City. During medical school, I spent a year doing pediatric oncology research at Memorial Sloan Kettering under the mentorship of Dr. Suzanne Wolden. I completed my transitional year internship at Memorial Sloan Kettering before entering the radiation oncology residency program.


Brandon Imber
Brandon Imber, MD, MA

I grew up on Long Island, NY and completed my undergraduate studies at Harvard University, where I majored in chemistry.  At Harvard, I also received a masters degree in chemistry and chemical biology focusing on histone demethylase proteins.  I then was a healthcare management consultant at McKinsey and Company for three years, with a special interest in oncology projects.  I moved to the West Coast to attend medical school at the University of California, San Francisco (UCSF).  At UCSF, I also completed a yearlong fellowship in clinical and translational research studying the brain cancer glioblastoma, specifically the role of Gamma Knife radiosurgery for recurrent disease.  Prior to starting as a radiation oncology resident at MSKCC, I completed my internship in internal medicine at Northwestern Memorial Hospital in Chicago.


Leo Luo
Leo Luo, MD

I was born in China and grew up in Nashville, Tennessee. I studied biology and mechanical engineering at Massachusetts Institute of Technology and stayed in Boston to attend Harvard Medical School. During medical school I became interested in cancer biology and spent a research year exploring ovarian cancer genomics as an HHMI research fellow. Before coming to Memorial Sloan Kettering, I completed an internship in internal medicine at Massachusetts General Hospital.


Ken Pitter
Ken Pitter, MD, PhD

I was born and raised in Westchester, New York. After completing my undergraduate studies in environmental chemistry and molecular biology at Colby College, I worked for two years as a research technician at the Dana-Farber Cancer Institute studying programmed cell death. I then joined the Tri-Institutional MD-PhD Program of Weill Cornell Medical College, Rockefeller University, and Memorial Sloan Kettering. My thesis focused on using mouse models of glioma to investigate cancer biology and mechanisms of radiation resistance. I then completed a transitional year internship at Memorial Sloan Kettering before joining the Radiation Oncology Residency Program.


Emily Steinberger Weg
Emily Steinberger Weg, MD

I grew up in New Jersey and made the long trip across the bridge to attend Columbia University, where I majored in intellectual history. I then joined the Humanities and Medicine program at the Icahn School of Medicine at Mount Sinai. During medical school, I completed a year of clinical research at Memorial Sloan Kettering with Dr. Michael Zelefsky studying prostate cancer radiation with a focus on comparing the potential toxicities of various treatments to guide safer therapy. I also initiated a database to share research opportunities across the entire Sinai health system. After medical school, I came to Memorial Sloan Kettering for both the transitional year internship program and the radiation oncology residency program.


Minsi Zhang
Minsi Zhang, MD, PhD

I was born in China and grew up in Massachusetts.  I received my undergraduate degree in chemistry and molecular biology from Johns Hopkins University.  Afterwards, I attended the MD-PhD program at Duke University.  My thesis focused using primary animal models to study the role of hypoxia inducible factors on soft tissue sarcoma progression and response to therapy.  I completed a year of preliminary medicine at Maimonides Medical Center in Brooklyn prior to joining the radiation oncology residency program at Memorial Sloan Kettering.

Proton Therapy Fellow (July 2019 – June 2020)

Anna Lee

Anna Lee

I was born in South Korea and grew up in Atlanta. I completed my undergraduate studies in biology and Spanish at the University of Georgia and received a master’s in public health from Emory University. I attended medical school at Mercer University in Macon, Georgia, where I also completed my internship in medicine. I finished my residency training in radiation oncology at SUNY Downstate in Brooklyn prior to starting a proton therapy fellowship at MSK. My research interest is in developing clinical trials to better understand the efficacy of proton therapy.

Brachytherapy Fellow (July 2019-June 2020)

Arun Goel

Arun Goel
I grew up in Upstate New York. I completed my undergraduate education at Dartmouth College, and my medical education at Drexel University College of Medicine. I did my residency in internal medicine at Hahnemann Hospital in Philadelphia and in radiation oncology at California Pacific Medical Center in San Francisco. I completed a retrospective project examining toxicity outcomes for patients with prostate cancer treated with single fraction HDR brachytherapy plus hypofractionated external beam therapy. Prior to leaving San Francisco, I spent some time observing high dose rate (HDR) brachytherapy at UCSF, where I learned about the value of a freehand approach. I believe that brachytherapy is a valuable treatment modality in the management of prostate, gynecologic, and recurrent malignancies.