John Voorhees

John Voorhees: Attorney with Greenberg Traurig, LLP
  • Shareholder at Greenberg Traurig, LLP (1800 Attorneys)
  • The Tabor Center, 1200 17th Street, Suite 2400, Denver, CO 80202
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John Voorhees focuses his practice on litigation and compliance counseling, particularly on environmental, health care, fraud and white collar matters. John has defended Superfund, Clean Water Act cases and a wide variety of other civil and criminal cases. He has also represented hospitals and a disease management company in disputes with the Centers for Medicare and Medicaid Services (CMS) and is experienced litigating hospitals' Medicare reimbursement claims against CMS, as well as, fraud, waste and abuse claims.


•Complex civil and criminal litigation
•Environmental Regulatory Policy and Compliance Medicare and Medicaid
•Internal investigations
•Defense strategy development and implementation
•Renewable energy


•Hon John W. Kern, III, District of Columbia Court of Appeals, 1976-1977

Recognition & Leadership

Awards & Accolades

•Team Member, U.S. News - Best Lawyers , Best Law Firms Edition, Law Firm of the Year, Environmental Law, 2016
•Listed, The Best Lawyers in America, Litigation - Health Care, 2015-2018
•Named, Lawyer of the Year, Litigation - Health Care, Denver, 2017
•Listed, The Legal 500 United States, Litigation - Product Liability and Mass Tort Defense - Toxic Tort, 2014-2015
•Rated, AV Preeminent 5.0 out of 5

AV , AV Preeminent , Martindale-Hubbell Distinguished and Martindale-Hubbell Notable are certification marks used under license in accordance with the Martindale-Hubbell certification procedures, standards and policies.

Areas of Practice (6)

  • Litigation
  • Environmental
  • Pharmaceutical, Medical Device & Health Care Litigation
  • White Collar Defense & Special Investigations
  • Energy & Natural Resources
  • Federal Regulatory and Administrative Law

Education & Credentials

Contact Information:
303.685.7465  Phone
303.572.6540  Fax
University Attended:
Emerson College, B.A., 1973
Law School Attended:
The Catholic University of America, J.D., 1976
Year of First admission:
1976, District of Columbia; 1992, Colorado; U.S. Court of Appeals for the District of Columbia Circuit; U.S. Court of Appeals for the Fifth Circuit; U.S. Court of Appeals for the First Circuit; U.S. Court of Appeals for the Second Circuit; U.S. Court of Appeals for the Third Circuit; U.S. District Court for the District of Colorado; U.S. District Court for the District of Columbia; U.S. District Court for the District of Massachusetts; U.S. District Court for the District of Rhode Island

Professional & Community Involvement

•Co-Chair, Mental Health Task Force, Colorado Lawyers Committee, 2006-2009
•Chair, Board of Directors, Leave No Trace, 1999-2005
•Adjunct Professor, University of Colorado Law School, 1999
•Adjunct Professor, University College of the University of Denver, 1993-1999
•Adjunct Professor, University of Denver Law School, 1995-1998

Birth Information:
Bryn Mawr, Pennsylvania, 1951
Reported Cases:
Experience: Representative Matters: Cases; El Paso Natural Gas v. Department of Energy: et al. (D. Arizona). CERCLA contribution case against five federal agencies for contribution to clean up 19 Uranium mines in Arizona.; United States of America v. Charles E. Roemer and Carlos Marcello:, 703 F.2d 805 (5th Cir. 1983). Six-month jury trial resulting in the conviction of Carlos Marcello, the head of the organized crime family in New Orleans and member of the Commission or ruling body of the nationwide Mafia.; Public Corruption Rhode Island: . Special Counsel in the investigation of public corruption involving the senior management of the Providence Police Department, various officials in the Mayor's office, and the Rhode Island Attorney General's office.; United States of America v. E.F. Hutton & Company, Inc.:, D.R.I. (1987). Successful prosecution of stock brokerage company for money laundering and tax offenses.; Blackstone Valley Electric Co. v. Stone & Webster, Inc.:, 867 F.Supp. 73 (D. Mass. 1994). From 1993 until 2006, represented the Blackstone Valley Electric Company and the Narragansett Electric Company in litigation with Stone & Webster, Inc. and affiliated companies in determining the responsibility for environmental liability at 14 environmental waste sites caused by the operation of multiple manufactured gas plants and electric generating facilities in Massachusetts and Rhode Island.; In re LifeMasters Supported Selfcare, Inc.:, Case No. 8:09-bk-19722-ES (C.D. CA) (2011). Represented disease management company in bankruptcy proceedings in the United States Bankruptcy Court in the Central District of California involving a dispute with CMS in Oklahoma and Florida.; Commonwealth of Massachusetts v. Blackstone Valley Electric Co.:, 67 F.3d 981 (1st Cir. 1995). Represented NGRID and multiple subsidiaries in litigation in Massachusetts and Rhode Island involving the by-products of historic manufactured gas plant operations from 1850-1954.; Other Significant Representations; Represented financial institution in litigation with the State of Rhode Island for aiding and abetting environmental civil violations by lending to a developer who violated the Clean Water Act.; Represented Calloway Vineyards in trademark litigation involving America's Cup wine.; Represented Women and Infants Hospital in Providence, Rhode Island involving the kidnapping and subsequent recovery of a newborn baby from the maternity ward.; Represented Double Diamond Pale Ale in dealer termination litigation.; Represented The National Hockey League in civil litigation.; Represented citizens in NEPA litigation against the United States Air Force successfully halting the construction of Ground Wave Emergency Network Towers in coastal Massachusetts and Rhode Island.; Represented developers accused of defrauding Bank of New England in the development of a hotel, conference center, and golf course on Cape Cod.; Represented multiple electric utilities in Clean Water Act litigation in Rhode Island, New Hampshire and Massachusetts involving the cleanup of manufactured gas plant sites.; Represented 29 non-profit hospitals in Medicare reimbursement litigation against the CMS.; Represented hospitals in multiple investigations of alleged Medicare and Medicaid fraud.; Represented developers of shopping centers in contract litigation.; Represented business entities, a University, and transportation companies in multiple criminal investigations involving violations of the Clean Water Act, RCRA, CERCLA, the Clean Air Act and other state and federal regulations and criminal statutes.; Represented individuals in federal criminal proceedings involving bank fraud, telemarketing, securities, and tax fraud.; Represented the Special Inspector General for Iraq Reconstruction in standing up of his office and the initial investigations of contractor fraud, waste and abuse in Iraq.; Assisted the People's Republic of China in using multiple legal and environmental regulatory processes to reduce algae growth pollution in Lake Tai, a drinking water source for 35 million people in China.; Represented the Appalachian Trail Conservancy in multiple matters involving the Appalachian Trail management.; Represented the Leave No Trace Center for Outdoor Ethics in various matters.; Represented a non-profit in efforts to repatriate the Parthenon Sculptures from the British Museum to the New Acropolis Museum in Athens, Greece.

Peer Reviews

  • 5.0/5.0
  • A Martindale-Hubbell Peer Rating reflects a combination of achieving a Very High General Ethical Standards rating and a Legal Ability numerical rating.

*Peer Reviews provided before April 15, 2008 are not displayed.

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