John P. Marren

john marren sm

Practice Areas

Health Care
Nonprofit Organizations
Tax Exemption
General Corporate, Business and Commercial

T: 312-946-1800
F: 312-946-9818
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John P. Marren is a founding partner of the firm of Hogan Marren Babbo & Rose Ltd and, has more than 30 years experience in health care and general corporate, not-for-profit and transactional law. He is recognized as a national expert in managed care, Accountable Care Organization (ACO) development and other hospital/physician alignment strategies.  Mr. Marren has consistently been listed as a leading lawyer in Chambers USA in Healthcare and is recognized for having “pioneered managed care legal issues” and for his  “significant involvement in structuring clinically integrated provider networks” as well has his expertise in  “antitrust compliance matters.”

More about John Marren

Mr. Marren has provided legal leadership in the formation of hospital affiliations, systems and networks, physician/hospital affiliations, ACOs PHOs, and development of HMOs and PPOs and has worked with the Illinois Department of Insurance to develop regulations.  Mr. Marren is currently active in assisting providers in the formation of creative relationships among physicians, hospitals and payors.

Professional Memberships/Activities

 Mr. Marren is the Consulting Editor of the “Managed Care Law Manual, Health Law Center.”  Mr. Marren is an Associate Professor on the faculty of Loyola University of Chicago College of Law and has been an adjunct faculty member with the J.L. Kellogg Graduate School of Management, Northwestern University.  Mr. Marren is a member of the American Health Lawyers Association, the Chicago Bar, Illinois State Bar and American Bar Associations.


Mr. Marren is frequently asked to speak regarding various health and managed care law issues and has authored numerous articles, including The Legal Framework for Clinical Integration, (Clinical Integration Task Force (2009) Texas Hospital Association); Clinical Integration: Lessons Learned (the Good, the Bad, and the Ugly), American Health Lawyers Association (2008); Law of Medical Practice in Illinois, 3d Edition, Chapter 13, “Managed Care”  (Thompson-West, 2007); Clinical Integration as a Physician-Hospital Alignment Strategy,(American Federation of Hospitals –Fall Policy Conference (Sept. 2007));  Clinical Integration: Practical Insights and Current Developments, (The Institute for Clinical Quality & Value (June 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: 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)); “Clinical Integration: Managed Care Contracting as a Catalyst for Quality Medicine”, ( Physician Organizations, vol. 9, issue 2, (June 2006) American Health Lawyers Association); Hot Topics in Managed Care, (The American Association of Integrated Healthcare Delivery Systems (June 2006)); The FTC and Provider Networks: Collision at the Crossroads, (Chicago Bar Association, Antitrust Section (May 2003);  The Hospital Board at Risk and the Need to Restructure the Relationship with the Medical Staff:  Bylaws, Peer Review and Related Solutions (Annals of Health Law, Loyola University Chicago School of Law); Lack of Proper Board Oversight Can Result in IDS Failure (Integrated Health Care Delivery Systems); The Emperor Has No Clothes (Trustee Magazine); How to End a Patient Relationship (Methodical approach needed for treatment termination) (American Association of Orthopedic Surgeons “Bulletin”); Integrated Delivery System Formation and Continuation: A Critical Analysis (University Health System Consortium); Emerging Legal Issues (Managed Care Quarterly); Managed Care Under the Gun; Suing Your Managed Care (Managed Care Quarterly); New Patient’s Rights: Providers Beware (Managed Care Interface); The Managed Care Market and the Anesthesiologist (ISA Today); Managed Care and the Law (Direct Contracting & Hospital Managed Care); Legal Issues in Accepting Capitation (Physician Executive); Forming PHOs for Direct Contracting (Medical Group Management Journal); and Buying and Selling Hospital Care:  Elements of Rational Managed Care Contracting (Journal of Health and Hospital Law).


Illinois (1983)
U.S. District Court, Northern District of Illinois


Loyola University School of Law (J.D., 1983)

St. Xavier University (B.A., Psychology & Biology, 1970)