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Department of Surgery »  Faculty »  Emeritus Faculty »  Orlo Clark, M.D.

Orlo Clark, M.D.

Professor Emeritus of Surgery
Division of General Surgery

Contact Information

Campus Box 1674
University of California, San Francisco
1600 Divisadero St.,
San Francisco, CA 94143-1674
Clinic:  (415) 353-7687
Voice: (415) 885-7616
FAX:    (415) 885-7617
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  • 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
  • 1995, Harvard School of Public Health, Unknown,  2 week Program for Clinical Chiefs
  • American Board of Surgery, 1974
  • UCSF Helen Diller Family Comprehensive Cancer Center
  • Adrenal Tumors
  • Adrenocortical Carcinoma
  • Conn's Syndrome
  • Cushing's Syndrome
  • Hyperparathyroidism
  • Hyperthyroidism
  • Laparoscopic Adrenalectomy
  • Laparoscopic Parathyroidectomy
  • Laparoscopic Thyroidectomy
  • Multinodular Goiter
  • Neuroendocrine  (Islet Cell) Tumors
  • Pheochromocytoma
  • Reoperative Endocrine Surgery
  • Thyroid Cancer
  • Thyroid Nodules
  • Thyroid and other endocrine neoplasms

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.

  1. Park JW, Zarnegar R, Kanauchi H, Wong MG, Hyun WC, Ginzinger DG, Lobo M, Cotter P, Duh QY, Clark OH. Troglitazone, the peroxisome proliferator-activated receptor-gamma agonist, induces antiproliferation and redifferentiation in human thyroid cancer cell lines. Thyroid. 15: 222-31, Mar/2005.
  2. Shen WT, Wong TS, Chung WY, Wong MG, Kebebew E, Duh QY, Clark OH. Valproic acid inhibits growth, induces apoptosis, and modulates apoptosis-regulatory and differentiation gene expression in human thyroid cancer cells. Surgery. 138: 979-84; discussion 984-5, Dec/2005.
  3. Caron NR, Tan YY, Ogilvie JB, Triponez F, Reiff ES, Kebebew E, Duh QY, Clark OH. Selective modified radical neck dissection for papillary thyroid cancer-is level I, II and V dissection always necessary? World J Surg. 30: 833-40, May/2006.
  4. Triponez F, Wong M, Sturgeon C, Caron N, Ginzinger DG, Segal MR, Kebebew E, Duh QY, Clark OH. Does familial non-medullary thyroid cancer adversely affect survival? World J Surg. 30: 787-93, May/2006.


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