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Dr. John R. Gregory, Thoracic Surgeon

Dr. John R. Gregory

Thoracic Surgeon
Affiliated Treatment Facilities
forum Contact Information
801 N 29th Street
Billings, MT  59101
(406) 238-2500
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Doctor Overview

Dr. John R. Gregory is a thoracic surgeon who practices in Billings, Montana. He is on staff at the Billings Clinic, which is a part of the Mayo Clinic Care Network. Thoracic surgeons commonly treat chest tumors like lung cancer and pleural mesothelioma. They can perform diagnostic procedures and cancer removal surgeries.

Dr. Gregory completed his medical degree at the University of Colorado. He went on to a fellowship at The University of Texas MD Anderson Cancer Center. He is board certified in general surgery. Dr. Gregory has been practicing medicine for more than 20 years.

Doctor Fast Facts

Main Specialty: Thoracic Surgery

Other Interests & Specialties: Abdominal surgery, collapsed lung, colon removal, gallbladder removal, hernia surgery and lung resection.

Certifications, Awards & Accolades: Board Certified in General Surgery

Education & Experience:

  • Medical Degree from the University of Colorado
  • Internship at HCA HealthONE /Presbyterian-St Luke’s Medical Center
  • Residency in Surgery at the University of California San Francisco
  • Residency in Surgery at Oregon Health & Science University
  • Fellowship in Thoracic Surgery at the University of Texas MD Anderson Cancer Center

Publications

Eclamptic manifestations occurring in pregnancy complicated by brain tumor. Am J Obstet Gynecol. 1950 Dec;60(6):1263–71.

Sources
  1. Billings Clinic - John R Gregory, FACS, MD; 3/17/2026

  2. U.S. News & World Report - Dr. John R. Gregory MD; 1/1/2026

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