UCI Health will see you now: Welcome to our new co-workers and patients from Fountain Valley, Lakewood, Los Alamitos and Placentia Linda! 

  Dr. Michael P. O'Leary is a board-certified UCI Health surgeon who is fellowship trained in surgical oncology.

Michael P. O'Leary, MD


Surgical Oncology

Clinical Interests

novel therapeutics for stage IV cancer, robot-assisted surgery, peritoneal surface malignancies, hyperthermic intraperitoneal chemotherapy (HIPEC)

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  • American Board of Surgery, Complex General Surgical Oncology
  • American Board of Surgery, Surgery
  • English
  • Spanish
Medical School
UC Irvine School of Medicine
Harbor-UCLA Medical CenterGeneral Surgery
City of HopeComplex Surgical Oncology
Professional Positions
  • Assistant Professor — Division of Surgical Oncology, Department of Surgery, UCI School of Medicine
  • Member — Gold Humanism Honor Society
Awards and Recognition
  • Young Surgeon Travel Award, American College of Surgeons, Southern California Chapter
  • Excellence in Teaching with Humanism in Medicine, UCLA
  • Senior Humanitarian Award, UCI School of Medicine
  • Intern of the Year, Harbor UCLA
  • Fellow of the Year, City of Hope
More Information

Dr. Michael P. O'Leary is a board-certified UCI Health surgeon who is fellowship trained in surgical oncology.

He earned his medical degree at UCI School of Medicine in Irvine, followed by a residency in general surgery at Harbor-UCLA Medical Center. Next, he completed a fellowship in complex surgical oncology at City of Hope in Duarte, Calif.

O’Leary’s focus is on peritoneal metastases, complex cytoreduction and hyperthermic intraperitoneal chemotherapy (HIPEC). He also has extensive surgical experience in hepatopancreatobiliary, gastric, colorectal, small intestine, melanoma, breast, endocrine and sarcoma malignancy. He has co-authored numerous manuscripts in peer-reviewed journals.

His research interests include the use of novel therapeutics to target and treat solid tumors. He is committed to medical student, resident and fellow education and has won numerous teaching awards. He is a Gold Humanism Honor Society Member and has been recognized for his display of humanism in medicine. O’Leary has a keen interest in global health and spent a year abroad in Kenya, where he hopes to continue outreach to the rural populations of East Africa to improve access to affordable and standardized cancer care. He is also a father of three children and enjoys running, fishing, golfing and embracing the gift of each new day.

O'Leary, who also speaks Spanish and is conversant in Kiswahili, sees patients in Orange.

UCI Health Chao Family Comprehensive Cancer Center
101 The City Drive South, Building 23
Orange, CA 92868
Phone: 714-456-8000
Fax: 855-211-3729