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James Lorenzen Boyer, MD, FACEP

Ensign Professor of Medicine (Digestive Diseases); Emeritus Director, Yale Liver Center

Contact Information

James Lorenzen Boyer, MD, FACEP

Patient Care Locations

Mailing Address

  • Yale School of Medicine

    Department of Medicine (Digestive Diseases), PO Box 208019

    New Haven, CT 06520-8019

    United States



Dr. James L. Boyer is the Ensign Professor of Medicine and Emeritus Director of the Liver Center at Yale School of Medicine. He is a graduate of Haverford College (1958) and the Johns Hopkins University School of Medicine (1962). From 1982 until 1996 he directed a combined Digestive Disease Section in the Department of Medicine. He was the founding Director of the NIDDK funded Liver Center at Yale since 1984. and former Director of the NIEHS Center for Membrane Toxicity Studies at the Mt Desert Island Biological Laboratory in Salsbury Cove, ME where he was also Chairman of their Board of Trustees from 1995 to 2003 and again from 2011-2013. He is also past Chair, Board of Directors of the American Liver Foundation and a past member of Board of Mangers of Haverford College. Dr. Boyer has a broad interest in all aspects of basic and clinical hepatology. His laboratory's major efforts have been the study of mechanisms of bile formation and cholestasis , previously supported by MERIT awards from NIDDK. He is a member of the AASLD, ASCI, AAP,APS and ACCA and past president of both the American and the International Association for the Study of Liver Disease. He is the recipient of Distinguished Achievement Awards from the AGA, AASLD and American Liver Foundation .He is a member of the Johns Hopkins School of Medicine Society of Scholars and the 2020 recipient of the European Association for the Study of Liver Disease's International Recognition Award.

Education & Training

  • Fellow
    Yale School of Medicine (1969)
  • Resident
    Yale - New Haven Hospital (1967)
  • Resident
    New York Hospital (1964)
  • MD
    Johns Hopkins University (1962)
  • AB
    Haverford College, Biology (1958)


  • Bile formation
    Austria; Switzerland; Germany; Italy; Netherlands; Thailand 2008
    Dr. Boyer collaborates with numerous researchers on projects related to the cellular and molecular mechanisms of bile formation and mechanisms of liver injury that lead to impairment of this important physiologic process. He has been engaged in this NIH funded work for the past 30 years.

Honors & Recognition

AwardAwarding OrganizationDate
Emeritus Director, Yale Liver Center2020
International Recognition AwardEuropean Association for the Study of Liver Disease2019
Johns Hopkins Society of Scholars -2016Johns Hopkins University2016
Spinoza ProfesesorshipUniversity of Amsterdam, the Netherlands2009
NIH MERIT AwardNational Institutes of Health2008
Distinguished Scientific Achievement AwardAmerican Liver foundation1999
Distinguished Achievement AwardAmerican Association for the Study of the Liver1998
Ismar-Boas MedalGerman Society of Gastroenterology and Metabolism1996
Ensign ProfessorshipYale University1996
Distinguished Achievement AwardAmerican Gastroenterology Association1989
Adolf-Windaus Prize Falk Foundation1988

Professional Service

Haverford CollegeBoard Member2009 - Present
Mt Desert Island Biological LaboratoryBoard Member1995 - 2013
American Liver Foundationvoluntary health agency1976 - Present
Yale University School of MedicineCommittee Member

Departments & Organizations