Our residents come from graduate schools around the U.S. and outside of the country. They have a love of learning and a compassionate approach to patient care. Our residents come from diverse backgrounds, family statuses, and professional and personal interests. Throughout the residency, residents and faculty foster a collegial environment and education-focused culture that provides an inclusive and collaborative learning experience.

From the senior residents

Welcome and thank you for your interests in the Mayo Clinic Rochester Medical Physics Residency program. As senior residents, we are proud to share with you what makes this program an exceptional place to begin your career. Over the past two years, we have grown not only as clinical physicists but also as contributors to research and innovation in the field. This has been made possible by the unique strengths of our program.

One of the most defining aspects of our residency is the size and accessibility of our faculty. With a large team of experienced physicists representing a broad range of specialties, we’ve had consistent mentorship and diverse perspectives throughout every rotation. Whether we needed guidance on patient care, designing a research project, or preparing for board exams, there was always someone ready to help.

Our clinical training has been immersive from day one. We’ve been actively involved in patient care, from treatment planning and chart checks to introducing new technologies into the clinic. The level of responsibility and trust placed in us as residents has prepared us to feel confident in transitioning to independent practice.

Perhaps most exciting is the breadth of technology available to us. From adaptive radiotherapy, proton therapy, and spatially fractionated techniques, the variety of platforms and modalities we’ve trained on has given us a well-rounded and forward-looking foundation.

However, the hallmark of our program is its strong research culture. A three-year residency is solely defined by the quality research available. Here, we’ve had the opportunity to contribute to meaningful projects, present at national conferences, and publish our work. The projects not only aim to publish work, but faculty members are actively ensuring that we residents see the translation of our projects into the clinic before graduation.

We are grateful to have trained in a program that not only emphasizes clinical excellence, but also encourages curiosity, collaboration, and innovation. If you are seeking a residency that offers comprehensive training, a vibrant academic environment, and exposure to some of the most advanced technologies in radiation oncology, we believe you will find it here.

We wish you the best in your search and hope to welcome you into our program soon.

Sincerely,
Dalton Griner, Ph.D., Cenji Yu, Ph.D., and Daiki Hara, Ph.D.
2025-2026 Senior Residents

Current residents

Learn about each resident's background, research/clinical interests, and why they chose to train at Mayo Clinic in Rochester, Minnesota.

Class of 2026

	Dalton Griner, Ph.D. Hometown: Sandy, UT Graduate school: University of Wisconsin (Ph.D.) Research/clinical interests: AI and automation, data management, innovative imaging Hobbies: Rock climbing, backpacking and hiking, guitar Why I chose Mayo: No.1 hospital speaks for itself!
	Daiki Hara, Ph.D. Hometown: Austin, TX Graduate school: University of Miami (Ph.D.) Research/clinical interests: Particle therapies, spatially fractionated radiotherapy, radiobiology Hobbies: Fishing, snowboarding, bonsai Why I chose Mayo: Mayo Clinic's Medical Physics Residency Program has it all. The Radiation Oncology Department is full of state-of-the-art technology operated by experts in the field, and it’s all incorporated into a renowned hospital solving highly complex cases. As one of the longest-running medical physics residency programs filled with friendly, education-focused faculty/staff, I felt I could fully absorb everything these facilities have to offer.
	Cenji Yu, Ph.D. Hometown: Shanghai, China Graduate school: The University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences (Ph.D.) Research/clinical interests: Image-guided radiation therapy, computer vision applications in radiation oncology Hobbies: Creative writing, basketball, skiing Why I chose Mayo: I chose Mayo for our dedication to patient care and education. Our program provides abundant learning opportunities with a variety of complex clinical procedures. We are also supported by caring experts who prioritize our personal growth and well-being.

Class of 2027

	Ruiming Edmondson, Ph.D., M.S. Hometown: Beijing, China Graduate school: University of Wisconsin – Madison (Ph.D.) Research/clinical interests: Image-guided radiation therapy, adaptive radiation therapy, motion management Hobbies: Zumba, pottery Why I chose Mayo: I was impressed by the department and the culture – the dedication to patient care, the commitment to training and education, and the delightful colleagues to work with all gave me great confidence for a successful and memorable residency.
	Darwin Garcia, Ph.D. Hometown:  Tegucigalpa, Honduras Graduate school:  Mayo Clinic Graduate School of Biomedical Sciences (Ph.D.) Research/clinical interests:  Radiobiology, spatially fractionated radiotherapy Hobbies: Playing soccer, distance running, cooking, and fishing Why I chose Mayo: I chose Mayo for the multi-modality and multi-specialty clinical practice. The clinical rotations cover a wide range of clinical procedures, which will give me an excellent, well-rounded training. Additionally, I am thrilled to learn and collaborate with scientists and clinicians that are world-class experts in the field.
	Brandon Reber, Ph.D. Hometown: Sexsmith, Alberta, Canada Graduate school: The University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences (Ph.D.) Research/clinical interests: Knowledge-based radiation treatment planning, deep learning radiation dose prediction, radiation late toxicities Hobbies: Hiking, learning Spanish, film Why I chose Mayo: I chose Mayo due to the incredible facilities, staff, and residents. I also appreciated the research opportunities available to residents.

Class of 2028

Photo coming soon	Holly Frank, Ph.D. Hometown: McLean, Virginia Graduate school: University of California-Los Angeles (Ph.D.) Research/clinical interests: Brachytherapy, treatment planning, novel optimization algorithms Hobbies: Swimming, reading, playing games, arts and crafts Why I chose Mayo: I chose Mayo for the chance to work at a world class institution renowned for pushing the boundaries of cutting-edge patient care. I am especially excited to join a program with such a strong dedication to education and a collaborative culture.
Photo coming soon	Toby Morris, Ph.D. Hometown:  Northaw, Hertfordshire, UK Graduate school:  University of Massachusetts Lowell (Ph.D.) Research/clinical interests: Novel Treatment Technologies/Techniques, Adaptive Radiotherapy, and Radiobiology Hobbies: Swimming, Guitar/Piano, Video Games, and Cooking Why I chose Mayo: The Radiation Oncology Department at the Mayo Clinic is world-renowned and shows as much passion for teaching and supporting their residents as they do towards their outstanding patient care. Being able to learn from the best in the field and having an opportunity to pursue meaningful, clinically focused research made the Mayo Clinic a natural decision for residency!
	Pragalv Karki, Ph.D. Hometown: Kathmandu, Nepal Graduate school: The University of North Dakota (Ph.D.) Research/clinical interests: Machine Learning-based dose prediction Hobbies: Hiking, pickleball, soccer, and guitar Why I chose Mayo: I knew that Mayo Clinic was a world class institution, but after working here I understood why it consistently ranks as the No. 1 hospital in the US. Mayo truly embodies its core shield of patient care, supported by its other two shields of education and research. Choosing Mayo was an easy decision after seeing how Mayo is transforming patient care of the present and future.