Photo of Daniel O. Herzig, M.D., F.A.C.S., F.A.S.C.R.S.

Daniel O. Herzig M.D., F.A.C.S., F.A.S.C.R.S.

  • (503) 494-4373
    • Professor of Surgery, Division of Gastrointestinal and General Surgery School of Medicine

Dr. Herzig earned his medical degree from Vanderbilt University and completed his surgical residency at Brown Medical School. At Brown, he won over a dozen awards for excellence in teaching, patient care, and research, including the Outstanding Resident Physician award in his last year. He went on to complete advanced training in colon and rectal surgery, including minimally invasive surgery and endoscopy at the University of Texas, Houston.

Dr. Herzig joined the faculty at OHSU in 2005. He completed the Human Investigations Program in 2009, and was promoted to Associate Professor in 2012. He is part of the OHSU Digestive Health Center and the OHSU Knight Cancer Institute. He specializes in the treatment of both cancerous and noncancerous diseases of the colon and rectum. Dr. Herzig is committed to providing the highest quality personal service to each individual. Because of this, he has been recognized as one of "Portland's Top Doctors" and has been named as one of "America's Top Surgeons."

Dr. Herzig's research interests include colorectal surgery outcomes, hereditary colorectal cancer syndromes, timing of surgery, and non-operative management of rectal cancer. He has started the state's first Colorectal Cancer Registry and has collaborated with other researchers at OHSU to continue this institution's leadership in colorectal cancer research.

Institutionally, he is the moderator of the weekly GI Oncology Tumor Board, and is the Surgical Director for gastroenterology endoscopy privileging. Regionally, he was the President of the Oregon Chapter of the American College of Surgeons for the 2014-2016 term, as well as the Local Arrangements Chair of the North Pacific Surgical Association for 2015. Nationally, he is on the Communications Committee for the Society for Surgery of the Alimentary Tract and the Clinical Practices Guidelines Committee for the American Society of Colon and Rectal Surgeons. He is sought after institutionally, locally, and nationally to lecture on colon and rectal cancer, Inflammatory Bowel Disease (IBD), Crohn's disease, and pelvic floor disorders.

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  • M.D., Vanderbilt University School of Medicine, Nashville Tennessee 1999
  • Residency:

    • General Surgery, Brown University/Rhode Island Hospital, Providence, RI  1999-2004
  • Fellowship:

    • Colorectal Surgery, University of Texas Health Science Center at Houston, Houston, TX, 2004-2005
  • Certifications:

    • American Board of Surgery, 2005
    • Colon and Rectal Surgery, 2006

Memberships and associations

  • Fellow, American College of Surgeons


  • "Warm water infusion during sedated colonoscopy does not decrease amount of sedation medication used" Gastrointestinal Endoscopy December 2012
  • "Initial surgical management of ulcerative colitis in the biologic era" Diseases of the Colon and Rectum  2014
  • "Colorectal cancer emergencies" Journal of Gastrointestinal Cancer June 2013
  • "Management of colonic injuries in the combat theater" Diseases of the Colon and Rectum May 2010
  • "Specialized practice reduces inpatient mortality, length of stay, and cost in the care of colorectal patients" Diseases of the Colon and Rectum July 2011
  • "Dramatic decreases in mortality from laparoscopic colon resections based on data from the nationwide inpatient sample" JAMA Surgery May 2011
  • "Surgeon leadership enables development of a colorectal cancer biorepository" American Journal of Surgery May 2013
  • "Molecular markers for colon diagnosis, prognosis and targeted therapy" Journal of Surgical Oncology January 1 2015
  • "Steroids and one-stage restorative proctocolectomy in ulcerative colitis" World Journal of Surgery March 2007
  • "Nonfamilial Adenomatous Polyposis/Nonhereditary Nonpolyposis Colorectal Cancer Hereditary Polyposis and Cancer Syndromes (MAP, Syndrome-X, Muir-Torre, etc)" Seminars in Colon and Rectal Surgery June 2011
  • "Psychiatric Illness is a Disparity in the Surgical Management of Rectal Cancer" Annals of Surgical Oncology September 11 2015
  • "Effect of Surgical Approach on 30-Day Mortality and Morbidity After Elective Colectomy" Journal of Gastrointestinal Surgery June 2012
  • "The posterior approach to inguinal hernia repair" Problems in General Surgery December 2002
  • "Phagocytosis and oxidative-burst response of planktonic Staphylococcus epidermidis RP62A and its non-slime-producing variant in human neutrophils" Clinical and Vaccine Immunology  1997
  • "Ambulatory hemorrhoidectomy"   2009
  • "Care of the patient with anorectal trauma" Clinics in Colon and Rectal Surgery  2012
  • "Adoption of laparoscopy for elective colorectal resection" Journal of the American College of Surgeons June 2012
  • "Chemoradiotherapy with a radiation boost for anal cancer decreases the risk for salvage abdominoperineal resection" Annals of Surgical Oncology October 1 2014
  • "Anal Fissure" Surgical Clinics of North America February 2010
  • "The impact of practice environment on laparoscopic colectomy utilization following colorectal residency" Colorectal Disease March 2012
  • "Increasing the number of lymph nodes examined after colectomy does not improve colon cancer staging" Journal of the American College of Surgeons  2014
  • "Laparoscopic converted to open colectomy" American Journal of Surgery May 2011
  • "Addressing the appropriateness of elective colon resection for diverticulitis" Annals of Surgery  2014
  • "Use and outcomes of emergent laparoscopic resection for acute diverticulitis" American Journal of Surgery May 2012
  • "Stage III & IV colon and rectal cancers share a similar genetic profile" American Journal of Surgery May 2013
  • "Avirtual reality endoscopic simulator augments general surgery resident cancer education as measured by performance improvement" Journal of Cancer Education  2014
  • "Effect of adding mFOLFOX6 after neoadjuvant chemoradiation in locally advanced rectal cancer" The Lancet Oncology August 1 2015
  • "Treatment strategies and outcomes for rectal villous adenoma from a single-center experience" JAMA Surgery September 2008
  • "Laparoscopic proctectomy after neoadjuvant therapy" Surgical Endoscopy and Other Interventional Techniques June 2011
  • "Disparities in the treatment of colon cancer in octogenarians" American Journal of Surgery May 2009

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