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Specialties:
  • Minimally Invasive Laparoscopic Surgery
  • Robotic Surgery
  • Colorectal Surgery
  • Breast Surgery
  • Surgical Oncology
  • Hernia Surgery
  • Endoscopic Procedures
  • Anti-reflux Surgery
  • Emergency Trauma Care
  • Diseases of the Thyroid and Parathyroid Glands
  • Vascular Surgery
  • Endovascular Surgery
  • Thoracic Surgery
  • Radiofrequency Ablation for Varicose Veins

Personal Info

Dr. Brennan is a Board Certified General Surgeon.  He received his undergraduate degree from the University of Notre Dame and medical degree from the University of Wisconsin School of Medicine and Public Health.  He completed his residency in general surgery at Loyola University Medical Center in Maywood, Illinois.

He is a Fellow of the American College of Surgeons, a position that requires devotion to surgical practice and uncompromising adherence to the ethical standards of the College.  This designation means that Dr. Brennan’s education, training, surgical aptitude, professional experience and ethical conduct have passed a thorough evaluation and are consistent with the high standards expected of Fellows by the College. Dr. Brennan is also a Diplomate of the American Board of Surgery.  Certification as a Diplomate is voluntary and exhibits a surgeon’s dedication to continuous learning and providing superior care to patients.

Interests

Dr. Brennan’s interests include minimally invasive laparoscopic surgery, robotic surgery, endoscopy, surgical oncology, thoracic surgery, vascular surgery, endocrine surgery, pediatric surgery, colorectal surgery, endovascular surgery and emergency trauma care.  He has a special interest in robotic surgery and has performed over 600 robotic surgeries.

Education & Training

Undergraduate
University of Notre Dame, Notre Dame, IN 1993

Medical School
University of Wisconsin School of Medicine and Public Health, 1997

Internship
Loyola University Medical Center, Maywood, IL 1997-1998

Residency
Loyola University Medical Center, Maywood, IL 1998-2002
Chief Resident – Loyola University Medical Center, Maywood, IL 2001-2002

Licensure and Certifications
  • License, Medicine and Surgery, State of Wisconsin
  • Fellow of the American College of Surgeons
  • Diplomate of the American Board of Surgery
  • Advanced Trauma Life Support Certification
  • Verified Trauma Surgeon – American College of Surgeons
Hospital Associations
  • ThedaCare Regional Medical Center – Neenah, Neenah, WI
  • ThedaCare Regional Medical Center – Appleton, Appleton, WI
  • Children’s Hospital of Wisconsin – Fox Valley, Neenah, WI
  • ThedaCare Medical Center – New London, New London, WI
Current and Prior Leadership Positions
  • ThedaCare, Inc.  Board of Directors
  • ThedaCare, Inc.  Board of Directors, Quality Committee
  • ThedaCare, Inc.  Board of Directors, Executive Committee
  • ThedaCare, Inc. Board of Directors, Finance Committee
  • ThedaCare, Inc. Regional Medical Centers at Neenah and Appleton, Chairman, Medical Executive Committee
  • ThedaCare, Inc. Regional Medical Centers at Neenah and Appleton, Vice-Chairman, Medical Executive Committee
  • Childrens Hospital of Wisconsin – Fox Valley, Medical Executive Committee
Associations, Memberships & Organizations
  • American Medical Society
  • Wisconsin Medical Society
  • Winnebago County Medical Society
  • Wisconsin Surgical Society
  • American Trauma Society
  • Walk for Autism