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Dr. Richard Cassidy is a board-certified radiation oncologist who practices at our Fleming Island and Southpoint locations. Raised in North Florida, Dr. Cassidy received his medical degree from the University of Florida, where he was in the Junior Honors Medical Program and received Alpha Omega Alpha honors. He completed his radiation oncology training at Winship Cancer Institute of Emory University in Atlanta, GA, where he was chief resident.

Like many others, Dr. Cassidy has had personal experiences with cancer; both of his grandfathers lost their battles when he was young, and his grandmother lost hers soon after he finished medical school. “These losses sharpened my interest and focus in improving oncology care” he says. “It’s important to consider someone’s personal beliefs, wishes, and goals,” he continues; “my philosophy is to involve patients in their treatment plan, because cancer care is more than just addressing the medical condition – it involves the whole patient and their personal situation”.

As someone who grew up playing sports, Dr. Cassidy believes that complex cancer care is a team sport. He enjoys working closely with other physicians, nurses, pharmacists, and all of the medical staff needed for excellent patient care. “This cooperation makes for a close-knit atmosphere, which ultimately benefits patients and their families,” he says, continuing “the honor to serve my community and to directly give back to my hometown gives me extreme pride.”

When not at work, Dr. Cassidy enjoys spending time with his wife, their sons, and their families who are all located in the Jacksonville area. When he’s not chasing his toddler around, he still finds time to struggle playing basketball and golf, as well as being a slightly over the top fan of Florida Gator sports.

Curriculum Vitae


Radiation Oncology


American College of Radiation Oncology

American Brachytherapy Society

American Society for Radiation Oncology

American College for Clinical Oncology

American College of Radiology


Emory University


Emory University


University of Florida

Doctor of Medicine

University of Florida

Bachelor of Science



Clinical Project Recognition Award, ASTRO Annual Meeting


Featured Article, Applied Radiation Oncology News


Abstract Selected for ASTRO News Release, Thoracic Cancer Symposium


ASCO Conquering Cancer Foundation Merit Award at ASCO Annual Meeting


Surgical Oncology

"The Importance of Surgery in Scalp Angiosarcomas"

The Laryngoscope

"Disparities in Postoperative Therapy for Salivary Gland Adenoid Cystic Carcinomas"


"Health Care Disparities Among Octogenarians and Nonagenarians with State III Lung Cancer"

Practical Radiation Oncology

"Reproducibility in contouring the neurovascular bundle for prostate cancer radiotherapy."


"Healthcare disparities among octogenarians and nonagenarians with stage II and III rectal cancer."


“Next Generation Sequencing and Clinical Outcomes of Lung Adenocarcinomas Treated with Stereotactic Body Radiotherapy.”


“The Role of Postmastectomy Radiation in Women with Pathologic T3N0M0 Breast Cancer.”

Clinical Lung Cancer

“Stereotactic Body Radiotherapy for Early Stage Non-Small Cell Lung Cancer in Patients 80 Years and Older: A Multi-Center Analysis.”

JAMA Otolaryngology: Head and Neck Surgery

“Lymphovascular Space Invasion is Associated with Locoregional Failure and Reduced Survival in Node Negative Oral Tongue Cancer.”


“Can We Eliminate Neoadjuvant Chemoradiotherapy in favor of Neoadjuvant Multi-Agent Chemotherapy for Select Stage II/III Rectal Adenocarcinomas: Analysis of the National Cancer Database.”

American Association of Medical Dosimetrists

“Neurovascular Bundle-Sparing Radiotherapy for Prostate Cancer using MRI-CT Registration: A Dosimetric Feasibility Study.”

Leukemia & Lymphoma

“The role of radiotherapy for patients over age 60 with diffuse large B-cell lymphoma in the rituximab era.”

American Journal of Clinical Oncology

“Function Preservation after Conservative Resection and Radiotherapy for Soft Tissue Sarcoma of the Distal Extremity: Utility and Application of the Toronto Extremity Salvage Score.”

Journal of Radiation Oncology

“Radiation Therapy for Squamous Cell Carcinoma of the Subglottic Larynx.”