William P. Keefer

Partner Buffalo, New York City

As co-leader of Phillips Lytle’s Health Care and Life Sciences Team, William counsels hospitals, physician groups, payors and other health care clients on a broad array of issues, including fraud and abuse, corporate compliance, transactional arrangements, payer audits, agency actions, and federal and state court litigation.


Honors & Awards

  • City & State New York, Health Care 100 List, 2023, 2024
  • PoliticsNY, Power Players in Health Care, 2023
  • Listed in The Best Lawyers in America®
    • Named the Best Lawyers® Health Care Law “Lawyer of the Year” in Buffalo, 2023
  • Selected for the Upstate New York Super Lawyers® list, 2017-2023
  • Listed in Legal Elite of WNY, Business First of Buffalo and Buffalo Law Journal, 2015, 2017, 2018

Education & Admissions

  • The George Washington University Law School, J.D., with honors, 1991
  • St. Bonaventure University, B.B.A., magna cum laude, 1985
Admitted to Practice
  • New York
  • Massachusetts
  • U.S. District Court, Northern and Western Districts of New York
  • Certified Public Accountant, New York State, 1987

Speaking Engagements

View All
  • Moderator, “The Opioid Epidemic and Its Impact on Health Care in Western New York,”Buffalo Business First State of the Region Breakfast, October 2018
  • Speaker, “HIPAA Security Rule, HITECH and GDPR for Today’s Practice,” Phillips Lytle Monthly Data Security Download, April 2018
  • Panelist, “Legal, Medical and Ethical Aspects of End-of-Life and Palliative Care and Planning: What Every New York Lawyer Needs to Know,” Erie Institute of Law Event, September 2015
  • Speaker, “Federal Anti-Kick Back and Sunshine Laws,” University at Buffalo School of Medicine and Biomedical Sciences’ Legal and Management Luncheon, January 2015

Activities & Professional Associations

Present Activities

  • SABAH, Inc., Board of Directors
    • Past Chair and Past Treasurer
  • Rotary Club of Buffalo, Board of Directors, Member
  • Buffalo Philharmonic Orchestra
    • Board of Trustees, Secretary
    • Governance Committee, Chair

Past Activities

  • Buffalo Rotary Foundation, President
  • Erie County Bar Association Health Law Committee, Chair
  • Mary M. Gooley Hemophilia Center, Inc., Board of Directors
  • Canisius High School Mock Trial Team, Attorney Coach

Professional Associations

  • American Bar Association
    • Business Law Section
    • Health Law Section
  • American Health Lawyers Association
    • Fraud and Abuse Practice Group
    • Regulation, Accreditation and Payment Practice Group
  • Bar Association of Erie County
    • Commercial Litigation and Bankruptcy Law Committee
    • Health Law Committee
  • New York State Bar Association
    • Health Law Section, Secretary
      • Payment, Enforcement and Compliance Committee, Chair

Articles & Publications


  • Co-Author, “New York State to Require Disclosure of Certain Material Health Care Transactions,” Buffalo Business First, July 2023
  • Co-Author, “The PREP Act Revisited: Limitations of Immunity and Federal Court Jurisdiction for Nursing Homes,” New York Law Journal, May 2022
  • Co-Author, “The Federal No Surprises Act Creates a Dual Framework To Protect New York Patients from Balance Billing,” Health Law Journal, NYSBA, May 2022
  • Co-Author, “Federal Health Care Program Exclusion Lists and the Employee Screening Process,” Health Law Journal, New York State Bar Association, May 2021
  • Author, “HHS Finalizes Changes to the Stark Law and Anti-Kickback Statute,” Buffalo Business First, March 2021
  • Co-Author, “CARES Act Increases Medicare Provider Payments Through Sequester Relief,” Buffalo Business First, May 2020
  • Co-Author, “Pending Legislation Would Ease Hospital Delivery of Physician Services,” Buffalo Business First, July 2019
  • Co-Author, “The Cost of ‘Compassionate Care,’” Western New York Physician, January 2019


  • Co-Author, “The New York State Physician’s HIPAA Privacy Manual, Second Edition,” New York State Bar Association, August 2016