John P. Marren

Top rated Health Care attorney in Chicago, Illinois

Hogan Marren Babbo & Rose, Ltd.
John P. Marren
Hogan Marren Babbo & Rose, Ltd.

Practice Areas: Health Care, Antitrust Litigation, Business & Corporate; view more

Licensed in Illinois since: 1983

Education: Loyola University Chicago School of Law

Selected to Super Lawyers: 2008 - 2019

Hogan Marren Babbo & Rose, Ltd.

161 N Clark St
Suite 1700
Chicago, IL 60601 Visit website


Attorney John P. Marren is a founding partner of Hogan Marren Babbo & Rose, Ltd., law firm in Chicago, Illinois. A recognized authority in a variety of legal areas, Mr. Marren has more than 38 years of total legal experience, and he provides unmatched counsel to clients throughout his region and all across the country who have legal needs involving any of the following:

  • Health care law
  • Antitrust and trade regulation
  • Nonprofit and tax-exempt organizations
  • Corporate and transactional matters

Prior to becoming an attorney, Mr. Marren worked for more than 10 years in the health care industry, gaining invaluable clinical and administrative experience. Drawing upon that, he is able to better address his clients' issues as he works diligently to help them pursue their goals and the favorable outcomes they seek for their legal challenges as efficiently and cost-effectively as possible.

A leader in health care law, Mr. Marren has served as lead counsel on a number of high-profile and high-stakes initiatives, including the formation of the Northwestern Healthcare Network and the Loyola University Chicago health system. He has also worked on many other complex joint ventures, mergers and similar cases that required antitrust oversight.

A 1970 graduate of St. Xavier University with degrees in psychology and biology, Mr. Marren obtained his Juris Doctor from Loyola University Chicago School of law in 1983. The Illinois State Bar Association admitted him to practice that same year, and he is also admitted to practice before the U.S. District Court for the Northern District of Illinois.

Mr. Marren has served as associate professor at Loyola University Chicago College of Law and as adjunct instructor at Northwestern University's J. L. Kellogg Graduate School of Management. He has also served as consulting editor to the Managed Care Law Manual, Health Law Center. He is an active member of the American Health Lawyers Association, The Chicago Bar Association and the American Bar Association, among his other professional affiliations.

Practice areas

Health Care, Antitrust Litigation, Business/Corporate, Nonprofit Organizations

Focus areas

Antitrust & Trade Litigation, Business Formation and Planning, Business Organizations, Health & Health Care Law, Non-profit & Tax-exempt Organizations

  • 30% Health Care
  • 30% Antitrust Litigation
  • 20% Business/Corporate
  • 20% Nonprofit Organizations

First Admitted: 1983, Illinois

Professional Webpage:

Bar/Professional Activity:
  • American Health Lawyers Association, Member
  • American Bar Association, Member
  • Illinois State Bar, Member
  • Chicago Bar, Member
  • U.S. District Court, Northern District of Illinois
  • Illinois, 1983
Scholarly Lectures/Writings:
  • “How to End a Patient Relationship (Methodical Approach Needed for Treatment Termination),” American Association of Orthopedic Surgeons Bulletin
  • J.L. Kellogg Graduate School of Management, Northwestern University, Adjunct Faculty Member
  • Loyola University of Chicago College of Law, Associate Professor
  • “Buying and Selling Hospital Care: Elements of Rational Managed Care Contracting,” Journal of Health and Hospital Law
  • “Forming PHOs for Direct Contracting,” Medical Group Management Journal
  • “Legal Issues in Accepting Capitation,” Physician Executive
  • “Managed Care and the Law,” Direct Contracting & Hospital Managed Care
  • “The Managed Care Market and the Anesthesiologist,” Illinois Society of Anesthesiologists Today
  • “New Patient’s Rights: Providers Beware,” Managed Care Interface
  • “Managed Care Under the Gun; Suing Your Managed Care Plans,” Managed Care Quarterly
  • “Emerging Legal Issues,” Managed Care Quarterly
  • “Integrated Delivery System Formation and Continuation: A Critical Analysis,” University Health System Consortium
  • “Law of Medical Practice in Illinois, 3rd Edition, Chapter 13, “’Managed Care,’” Thompson-West (2007)
  • “The Emperor Has No Clothes,” Trustee Magazine. (July 2000)
  • “Lack of Proper Board Oversight Can Result in IDS Failure,” Integrated Health Care Delivery Systems
  • “The Hospital Board at Risk and the Need to Restructure the Relationship with the Medical Staff: Bylaws, Peer Review and Related Solutions,” Loyola University Chicago School of Law, Annals of Health Law
  • “The FTC and Provider Networks: Collision at the Crossroads,” Chicago Bar Association, Antitrust Section (May 2003)
  • “Hot Topics in Managed Care,” The American Association of Integrated Healthcare Delivery Systems (June 2006)
  • “Clinical Integration: Managed Care Contracting as a Catalyst for Quality Medicine,” American Health Lawyers Association, Physician Organizations, Vol. 9, Issue 2 (June 2006)
  • “Clinical Integration: A Physician and Hospital Strategy for Better Quality, Enhanced Competition, and Collective Contracting, Hospitals and Health Systems Law Institute,” American Health Lawyers Association (Feb. 2007)
  • “The FTC’s Advocate Health Decision and Its Impact on PHO’s, Clinical Integration, and Price Fixing,” The American Bar Association, Health Law Section (June 2007)
  • “Clinical Integration: Practical Insights and Current Developments,” The Institute for Clinical Quality & Value (June 2007)
  • “Clinical Integration as a Physician-Hospital Alignment Strategy,” American Federation of Hospitals, Fall Policy Conference (Sept. 2007)
  • Consulting Editor, “Managed Care Law Manual, Health Law Center”
  • “Clinical Integration: Lessons Learned (the Good, the Bad, and the Ugly),” American Health Lawyers Association (2008)
  • “The Legal Framework for Clinical Integration,” Texas Hospital Association, Clinical Integration Task Force (2009)
  • “Clinical Integration Networks and Accountable Care Organizations: Topics for Developing High Value CINs and ACOs,” American Health Lawyers Association Physician and Hospital Law Institute (2018)
  • Adjunct Faculty Member, L. Kellogg Graduate School of Management, Northwestern University
  • Associate Professor, Loyola University of Chicago College of Law
Educational Background:
  • St. Xavier University, B.A., Psychology & Biology, 1970

Office location for John P. Marren

161 N Clark St
Suite 1700
Chicago, IL 60601

Phone: 312-946-1800


12 Years Super Lawyers
  • Super Lawyers: 2008 - 2019

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