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Bariatric Surgery »  Meet the Team »  Bariatric Surgeons »  Andrew M. Posselt, M.D., Ph.D.

Andrew M. Posselt, M.D., Ph.D., FACS

  • Professor of Surgery
  • Division of Transplant Surgery
  • Director, Pancreatic Islet Transplant Program

Contact Information

Academic Office
(415) 514-5606
[email protected]
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  • Stanford University, B.S., Biology, 1981-85
  • University of Pennsylvania, M.D., Medicine, 1985-93
  • University of Pennsylvania, Ph.D., Immunology, 1989-93
  • University of California, San Francisco, Resident, Medicine, 1993-96
  • University of California, San Francisco, Resident, Surgery, 1996-00
  • University of California, San Francisco, Fellow, Transplant Surgery, 2000-02
  • American Board of Internal Medicine, 1996
  • American Board of Surgery, 2002
  • Pancreatic Islet Transplantation Program
  • Bariatric Surgery Center
  • ABO-Incompatible Kidney Transplant Program
  • Autologous Islet Cell Transplantation
  • Bariatric Surgery (Laparoscopic and Open)
  • Bile Duct Injuries
  • Bile Duct Strictures
  • Choledochal Cyst Disease
  • End-Stage Kidney Disease
  • Fulminant Hepatic Failure
  • Hepatitis B
  • Hepatitis C
  • Hepatocellular Carcinoma (Primary Liver Cancer)
  • Islet Cell Transplantation
  • Kidney Transplantation
  • Laparoscopic Donor Nephrectomy
  • Liver Cysts
  • Liver Transplantation
  • Nonalcoholic Fatty Liver Disease
  • Pancreas Transplantation
  • Pediatric Kidney Transplantation
  • Pediatric Liver Transplantation
  • Portal Hypertension
  • Assessment of long-term clinical outcomes in kidney donors
  • Clinical outcomes of bariatric surgery in patients with end-stage kidney or liver disease
  • Metabolic and biochemical consequences of bariatric surgery
  • Transplantation of pancreatic islets as treatment for type 1 diabetes mellitus

Dr. Andrew Posselt is an attending multi-organ transplant surgeon at UCSF and Director of the ABO-Incompatible Kidney Transplant Program as well as Co-director of the Pancreatic Islet Transplant Program and the Bariatric Surgery Program.  Dr. Posselt specializes in adult and pediatric kidney, liver and pancreas transplantation; laparoscopic donor nephrectomy; and laparoscopic as well as open bariatric surgery.  Dr. Posselt's current research interests include: 1) transplantation of pancreatic islets for the treatment of type 1 diabetes mellitus; 2) assessment of long-term renal function in kidney donors after donor nephrectomy; 3) immunologic and tolerogenic properties of embryonic stem cells; and 4) bariatric surgery in patients awaiting transplant. 

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  • Vertical Sleeve Gastrectomy for Treatment of NASH: a pilot randomized control
    Sponsor:
    Sponsor ID:
    Funding Period:
    Jul 2021
    -
    May 2024
    Co-Principal Investigator
  • Treatment of Type I Diabetes by Islet Transplantation into the Gastric Submucosa
    Sponsor:
    Sponsor ID:
    Funding Period:
    May 2014
    -
    Apr 2020
    Principal Investigator
  • "Advancing Islet Transplant for Type 1 Diabetes Care"
    Sponsor:
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    Funding Period:
    Sep 2009
    -
    Jul 2013
    Principal Investigator
  • Effect of Obesity on Long-Term Clinical Outcomes after Kidney Donation
    Sponsor:
    Sponsor ID:
    Funding Period:
    Sep 2009
    -
    Jun 2012
    Principal Investigator
Data provided by UCSF Profiles, powered by CTSI
MOST RECENT PUBLICATIONS FROM A TOTAL OF 113
Data provided by UCSF Profiles, powered by CTSI
  1. Downs EM, Eaton A, Witkowski P, Wijkstrom M, Walsh M, Trikudanathan G, Singh VK, Schwarzenberg SJ, Pruett TL, Posselt A, Naziruddin B, Nathan JD, Mokshagundam SP, Morgan K, Lara LF, Gardner TB, Freeman ML, Ellery K, Chinnakotla S, Beilman GJ, Adams D, Ahmad S, Abu-El-Haija M, Bellin MD. Nutritional Risks in Patients Undergoing Total Pancreatectomy Islet AutoTransplantation in the POST Consortium. J Gastrointest Surg. 2023 09; 27(9):1893-1902. View in PubMed
  2. Wisel SA, Posselt AM, Szot GL, Nunez M, Santos-Parker K, Gardner JM, Worner G, Roll GR, Syed S, Kelly Y, Ward C, Tavakol M, Johnson K, Masharani U, Stock PG. A Multi-Modal Approach to Islet and Pancreas Transplantation With Calcineurin-Sparing Immunosuppression Maintains Long-Term Insulin Independence in Patients With Type I Diabetes. Transpl Int. 2023; 36:11367. View in PubMed
  3. Wu KC, Cao S, Weaver CM, King NJ, Patel S, Kim TY, Black DM, Kingman H, Shafer MM, Rogers SJ, Stewart L, Carter JT, Posselt AM, Schafer AL. Intestinal Calcium Absorption Decreases After Laparoscopic Sleeve Gastrectomy Despite Optimization of Vitamin D Status. J Clin Endocrinol Metab. 2023 01 17; 108(2):351-360. View in PubMed
  4. Santandreu AG, Taheri-Tehrani P, Feinberg B, Torres A, Blaha C, Shaheen R, Moyer J, Wright N, Szot GL, Fissell WH, Vartanian S, Posselt A, Roy S. Characterization of human islet function in a convection-driven intravascular bioartificial pancreas. Bioeng Transl Med. 2023 Mar; 8(2):e10444. View in PubMed
  5. Witkowski P, Philipson LH, Buse JB, Robertson RP, Alejandro R, Bellin MD, Kandeel F, Baidal D, Gaglia JL, Posselt AM, Anteby R, Bachul PJ, Al-Salmay Y, Jayant K, Perez-Gutierrez A, Barth RN, Fung JJ, Ricordi C. Islets Transplantation at a Crossroads - Need for Urgent Regulatory Update in the United States: Perspective Presented During the Scientific Sessions 2021 at the American Diabetes Association Congress. Front Endocrinol (Lausanne). 2021; 12:789526. View in PubMed
  6. View All Publications
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    A Complex Procedure for Life-Threatening Pancreatitis

    A Complex Procedure for Life-Threatening Pancreatitis One morning in December 2014, Lorelei Batty woke up screaming in pain and sick to her stomach. Emergency room doctors in her hometown of Santa Maria, Calif., thought the 3-year-old had the flu and sent her home. But Lorelei didn't improve over the next week and a half, and a far more serious diagnosis soon came in: pancreatitis, an inflammation of the pancreas that's rare in children and can be difficult to treat. After spending most of the next nine months in seven different hospitals with deteriorating health, Lorelei finally[...]
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