University of California San Francisco

Orlo Clark - 144x
Orlo Clark, MD

Professor Emeritus of Surgery
Division of General Surgery

Campus Box 1674
University of California, San Francisco
1600 Divisadero St.,
San Francisco, CA 94143-1674


    Dr. Orlo H. Clark is Emeritus Professor of Surgery at UCSF. Dr. Clark attended Cornell University and Cornell Medical School.  He completed his surgical training and residency at UCSF.  He also did a year Fellowship at the Royal Postgraduate Medical Center in London in Endocrine Surgery, and joined the UCSF faculty in 1973.  

    Dr. Clark was the previous Chief of Surgery at Mt. Zion Medical Center and the Vice Chair of the Department of Surgery.  Dr. Clark is recognized as a leader in his field both nationally and internationally.  He has been the President of the American Association of Endocrine Surgeons, the American Thyroid Association, the International Association of Endocrine Surgeons, and is  President  of the Pacific Coast Surgical Association.  He is an honorary member of the German Surgical Society, the Turkish Endocrine Surgical Society, the Asian Endocrine Surgical Society, and received a Docteur Honoris Causa (Honorary Doctorate) from Poitier University.  Dr. Clark has authored and co-authored over 300 journal manuscripts, chapters, and books. Highly respected by his peers, Dr. Clark was named to the list of U.S. News "America's Top Doctors," a distinction reserved for the top 1% of physicians in the nation for a given specialty.




    • 1959-63, Cornell University, B.A., Zoology
    • 1963-67, Cornell University, M.D., Medicine
    • 1967-68, University of California, San Francisco, Intern, Surgery
    • 1968-70, University of California, San Francisco, Resident, Surgery
    • 1971-72, University of California, San Francisco, Senior Resident, Surgery
    • 1972-73, University of California, San Francisco, Chief Resident, Surgery
    • 1970-71, Hammersmith Hospital, London, Royal Postgraduate M, Endocrine Surgery
    Postdoctoral Training
    • 1995, Harvard School of Public Health, Unknown,  2 week Program for Clinical Chiefs

    Board Certifications

    • American Board of Surgery, 1974

    Clinical Expertise

    Adrenal Tumors
    Adrenocortical Carcinoma
    Conn's Syndrome
    Cushing's Syndrome
    Laparoscopic Adrenalectomy
    Laparoscopic Parathyroidectomy
    Laparoscopic Thyroidectomy
    Multinodular Goiter
    Neuroendocrine  (Islet Cell) Tumors
    Reoperative Endocrine Surgery
    Thyroid Cancer
    Thyroid Nodules

    Program Affiliations

    UCSF Helen Diller Family Comprehensive Cancer Center 

    In the News

    October, 13, 2022 | UCSF Department of Surgery

    Research Interests

    Thyroid and other endocrine neoplasms