John P. Marren

Attorney Profile

Top Rated Health Care Attorney in Chicago, IL

Hogan Marren Babbo & Rose, Ltd.
 | 321 N Clark St, Suite 1301
Chicago, IL 60654
Phone: 312-946-1800
Fax: 312-946-9818
Selected To Super Lawyers: 2008 - 2019
Licensed Since: 1983
Practice Areas:
  • Health Care (30%),
  • Antitrust Litigation (30%),
  • Business/Corporate (20%),
  • Nonprofit Organizations (20%)
    Attorney Profile

    Attorney John P. Marren is a founding partner and shareholder with Hogan Marren Babbo & Rose, Ltd., law firm, which has law offices in Chicago, Illinois, and New York, New York. Widely regarded as among the top attorneys in his region as well as the entire country, Mr. Marren provides exceptional representation and support to clients throughout the Chicago and New York City metros 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 law and transactional services

    Along with possessing more than 37 years of total legal experience, Mr. Marren has more than 10 years of experience in the clinical and administrative areas of health care. As such, he has gained a reputation as a leading authority in health care law and the regulations and policies that govern the industry. He has a wealth of knowledge and experience with managed care, clinical integration, accountable care organization development and other alignment strategies for hospitals and physicians.

    In addition, Mr. Marren has assisted in the formation of hospital and physician affiliation networks and systems along with the HMO and PPO development. He has also worked with government authorities, such as the Illinois Department of Insurance and the Federal Trade Commission, to help develop effective legal strategies in the creation of clinical integration, and he routinely assists health care providers with forming strong, professional relationships among hospitals, physicians and payors.

    Drawing upon his extensive knowledge and experience with health care law, Mr. Marren currently serves as consulting editor of the “Managed Care Law Manual, Health Law Center" reference text, and he has served as faculty member at both the Loyola University Chicago School of Law and the Kellogg School of Management. He has also published numerous articles and conducted lectures and seminars throughout the United States on a variety of legal topics related to health care law clinical integration networks and other subjects.

    A 1970 graduate of St. Xavier University of a Bachelor of Arts in psychology and biology, Mr. Marren obtained his Juris Doctor from Loyola University Chicago School of Law in 1983. He is admitted to practice before the U.S. District Court for the Northern District of Illinois, and he is an active member of the American Health Lawyers Association, the Chicago Bar Association, the Illinois State Bar Association and the American Bar Association, among his other professional affiliations.

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


    Selected to Super Lawyers for 12 yearsbottom-image

    Super Lawyers: 2008 - 2019

    Email Me

    To: John P. Marren
    Super Lawyers: Potential Client Inquiry


    The information contained in this web site is intended to convey general information. It should not be construed as legal advice or opinion. It is not an offer to represent you, nor is it intended to create an attorney-client relationship. The use of the internet or this contact form for communication is not necessarily a secure environment. Contacting a lawyer or law firm email through this service will not create an attorney-client relationship, and information will not necessarily be treated as privileged or confidential.

    About John Marren

    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
    • “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
    Find Me Online
    Website -
    Show More
    Office Location for John P. Marren

    321 N Clark St
    Suite 1301
    Chicago, IL 60654

    Phone: 312-946-1800

    Fax: 312-946-9818

    John P. Marren:

    Last Updated: 2/18/2021

    Page Generated: 0.2701940536499 sec