William P. Keefer

Partner Buffalo, New York City

As 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
  • 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 District of New York
  • U.S. District Court, Western District 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

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
    • Health Law Committee
    • Commercial and Bankruptcy 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