John Olson, MD

John A. Olson Jr., MD, PhD

Specializes In
  • Surgical Oncology
  • General Surgery
Languages Spoken
  • English


Sees Patients For

Endocrine, Breast, and Oncologic Surgery; Hyperparathyroidism / Parathyroid surgery; Thyroid cancer / Thyroid surgery; Breast cancer / Breast surgery; Melanoma

Hospital Affiliations

  • Barnes-Jewish Hospital



Board Certifications

  • American Board of Surgery

Academic Title(s)

Chair, Department of Surgery
William K. Bixby Professor of Surgery

Research Interests

A recipient of multiple NIH grants, Dr. Olson achieved recognition for his groundbreaking basic science and clinical research on endocrine tumor formation. In particular, his work has led to a greater understanding of how excessive hormone and calcium levels can contribute to tumor development and disease, with a particular focus on how hyperparathyroidism leads to parathyroid neoplasia. His research team reported the first isolation and functional characterization of parathyroid cell subtypes from parathyroid tumors, findings that have enabled the field to hone in on the disease’s development and trajectory. Further, his clinical research has focused on novel endocrine therapies aimed at shrinking breast cancer tumors and determining biomarkers related to breast cancer outcomes.


Fellowship: Complex General Surgical Oncology

2000 Memorial Sloan-Kettering Cancer Center, New York, NY

Residency: General Surgery

1998 Washington University School of Medicine, St. Louis, MO

Fellowship: Specialist Registrar in Surgery

1997 Royal Infirmary, Edinburgh, Scotland

Fellowship: Postdoctoral Research

1996 Washington University School of Medicine, St. Louis, MO

Medical Degree

1992 University of Florida College of Medicine, Gainsville, FL

PhD: Pharmacology and Experimental Therapeutics

1990 University of Florida, Gainsville, FL

Bachelor's Degree: Cellular and Molecular Biology

1986 University of Michigan, Ann Arbor, MI