Board of Directors

Benjamin Li, MD, MBA

Dr. Li founded Rayos Contra Cancer with a vision to connect existing talent, technology, and resources to create a sustainable and scalable solution to the growing burden of cancer globally. He studied Physics at Harvard University before attending Vanderbilt University School of Medicine, where he received a certification in Global Health and obtained his Healthcare MBA from Owen Graduate School of Management. He completed his medicine internship at St. Mary’s Medical Center and is a current resident in radiation oncology at the University of California San Francisco.


He is a member of ASTRO, ASCO, and the Society for Palliative Radiation Oncology and serves on the Association of Residents in Radiation Oncology (ARRO) Global Health Subcommittee. He has traveled in Latin America and Asia and is passionate about serving the poor and motivating others to shine.

Founder, President

Executive Director 

Serguei Castaneda, MD

Dr. Castaneda is a Radiation Oncologist at Jefferson University. Originally from Colombia, he understands the potential for collaboration and connectivity to address gaps in care. He studied medicine at La Universidad de Antioquia, then was awarded a post-doc Fellowship at Massachusetts General Hospital and Boston University. Dr. Castaneda is a radiation oncologist with an expertise in global health who completed his residency at Hahnemann Hospital.

He served as a leader on the ARRO Global Health Subcommittee and founded the Mutual Mentorship program connecting residents across the globe in radiation oncology. He is a member of ASTRO, is active with Radiating Hope and is involved in research and work to improve radiotherapy in developing nations around the world.

Vice President

Director of Research

Oluwadamilola Oladeru, MD, MA

Dr. Oladeru is a Radiation Oncology Resident Physician who is driven by her experiences growing up in Nigeria and the vision of eliminating global cancer care disparities and providing palliative care services in neediest parts of the world where patients often die in pain and without dignity. 


She attended Yale University for premedical and graduate studies. She later graduated from Stony Brook University School of Medicine, during which she participated in Radiating Hope (Tanzania) and made a commitment to participate in initiatives that improve access to cancer care. She completed her medical internship at NYU Winthrop Hospital and is currently a PGY-4 Radiation Oncology Resident at Harvard where she is involved in ongoing prospective and retrospective studies aimed at improving patient and clinical outcomes.

She is a member of ASTRO, ASCO, ABS and currently serves on the Global Health Subcommittee of the Association of Residents in Radiation Oncology. She is trained in health care management and leading organizations. 

Director of Education

Director of Impact Analysis

Layth Mula-Hussain, MD

Dr. Layth "Yahya Ibrahim" Mula-Hussain is a board-certified radiation oncology physician with interest in academia and global cancer control. Born and educated in Mosul, Iraq, he then completed radiation oncology residency at the King Hussein Cancer Center, MSc in advanced oncology at Ulm University, and fellowships in general radiation oncology (Tom Baker Cancer Center) and community radiation oncology(Cross Cancer Institute).


He was the the first Middle-Eastern ESTRO Fellow in 2011 and the Founding Chairman of the first radiation oncology residency board-program in Kurdistan, Iraq (2013-2017). He served as the Chairman of the Best of ASTRO meetings and the Multi-Disciplinary Oncology Courses in Iraq (2015-2017). He also acted as an Expert within the imPACT IAEA team in Pakistan (2013), a trainer in the Awareness Without Borders campaign in Sudan (2016), and a member at the ASCO International Affairs Steering Committee (2016 - 2019). In 2017, he moved to Canada where he established (Together for Cancer Control) and later on, joined (Rayos Contra Cancer - RCC) in 2018 as Member of its BOD and being a Director of Education And Training for MENA region at RCC by 2020 to date.

Director of Education & Training

in the Middle East

Dante Roa, Ph.D.

Dr. Roa is a Medical Physicist whose primary interest has always been to develop and utilize the latest technology in radiation therapy to deliver the most efficient and effective treatment to a patient. For this purpose, he has worked in the implementation and dosimetric validation of a volumetric-modulated arc therapy (VMAT) treatment technique for stereotactic radiosurgery (SRS) which can offer patients precise and faster SRS treatments. He has given numerous presentations and webinars on the use of VMAT highlighting his experiences of its efficacy.


Furthermore, Dr. Roa teaches physics to radiation oncology (MDs) and medical physics residents (PhDs), a rewarding and stimulating experience. He embraces and pushes synergies formed by clinical perspectives, which often differs from the analytical approach that characterizes the physics field. 

He is a member of ALATRO, ALFIM, ASTRO, and the AAPM, and has received accolades for his extensive experience throughout Latin America promoting the safe and effective development for radiotherapy centers.

Board Member

Gustavo R. Sarria, M.D.



Dr. Sarria is a Radiation Oncologist who completed his residency training at Instituto Nacional de Enfermedades Neoplásicas, the national cancer institute of Peru. He strongly believes in collaboration and networking as a way to improve the access to radiation oncology in developing countries. His expertise comprehends hypofractionation techniques (SRS and SBRT), brachytherapy and intraoperative radiotherapy, translational and clinical research.


He is currently developing his career at the University Medical Center Mannheim / University of Heidelberg in Germany and takes part as a member of multiple scientific societies, including ASTRO, ESTRO, DEGRO, ABS and ALATRO.

Director of Development

Daniel Wakefield, MD




Dan Wakefield is chief resident physician in radiation oncology at the University of Tennessee and a MPH student at Harvard T.H. Chan School of Public Health.  He is a researcher at St. Jude Children’s Research Hospital in pediatric radiotherapy, and has focused his MPH thesis on RT disparities globally and in the Southern USA. He is passionate about health services and implementation science with a focus on operational quality improvement. 

Director of Operations

Current Project Managers

Fei Yang, BA

Fei Yang is a Vanderbilt graduate with a B.A. in Art, Neuroscience, and Medicine, Heath, and Society. For the last four years, she has been studying less understood proteins in cellular signaling pathways. Most of her other involvements in college are related to international cultures and service. She is now a research assistant at the Vanderbilt Eye Institute, working on drug development for human eye diseases such as Macular Degeneration.


Having grown up in China and spent her junior year of college abroad in Africa, Europe, and Oceania, she has experienced a vast discrepancy in healthcare systems and delivery among different countries, motivating her to advocate for global health. As a project manager for Rayos Contra Cancer, she hopes to sustainably contribute to the cause and learn more ways to help in her future career.

Project Manager, Nashville

Raymond Carter, BA

Raymond Carter is a Vanderbilt Graduate with a B.A. in Neuroscience and Medicine, Health, & Society. While at Vanderbilt, Raymond conducted research into the disregulation of complex motivated behavior and how it contributes to addiction, anxiety, and depression. He is now at St. Jude Children’s Research Hospital in Memphis, Tennessee studying the epigenetic mechanisms of untreatable pediatric cancer. 


In his home town of Huntsville, Alabama, Raymond has spent time working with rural health groups and has seen firsthand the effects of healthcare inequity. He is passionate about improving health outcomes as well as patient literacy and numeracy in marginalized groups both at home and abroad. As a project Manager for Rayos Contra Cancer, Raymond hopes to gain knowledge about global health access issues in order to better serve the global population as a future physician-scientist. 

Project Manager, Memphis

Graduated Project Managers

Betty Chang, BA

Betty Chang is a Vanderbilt graduate with a B.A. in Neuroscience and in Spanish. For the last 4 years, she has been conducting research into disorders related to motivational dysregulation and addiction. Her involvement in college centered around the pillars of mentorship, teaching, and community service and these continue to drive her commitments today.

Through time volunteering in clinics that aim to serve the uninsured population in Nashville, she has seen the devastating effects of inequality in healthcare access. As a project manager for Rayos Contra Cancer, she hopes to gain more insight into how improving radiation treatment can better the patient experience in low- and middle-income countries around the world. She is currently applying to medical school and is excited to gain knowledge about global health issues so that she can be more equipped to help solve them in the future.


Project Manager

Sameeksha Malhotra, BA

Sameeksha Malhotra is a Vanderbilt graduate with a B.A. in Neuroscience & Medicine, Health, and Society. She holds a firm belief that healthcare is a human right, and is interested in working in medically marginalized communities that do not have access to this necessity. 

She has experience volunteering in the Fundacion Psicologia Integral Basted clinic in Quito, Ecuador, where she developed a thesis on the rates of drug abuse and sexual health education in Ecuadorian adolescents. She hopes to use this knowledge of the Latin American healthcare system in her role as Project Manager to help drive Rayos Contra Cancer forward. She is currently applying to medical school, and hopes to use this gap year to set a foundation for her career in global health.



Project Manager

Jackie Hao, BS

Jackie Hao is a Vanderbilt graduate with a B.S. in Cellular & Molecular Biology and a minor degree in Psychology. He has conducted research in nucleosome assembly and its role in cancer and genome stability. Before graduating, he also helped organize the single largest fundraising event planned at Vanderbilt.


As an immigrant born in China, he has seen and experienced the disparity in healthcare and its impact on those that reside in medically underserved communities. He served as an outstanding project manager for Rayos Contra Cancer in 2018-2019 with the drive to alleviate the burden of cancer in low-resource areas. Now in medical school, he hopes to expand the network of this global health initiative to the next chapter of his medical training.


Project Manager


RCC Chapter National President