Dennis M. Mahoney, M.D.

Dennis M. Mahoney, MD

Founder (In Memoriam)
Dennis M. Mahoney, M.D.

Dennis M. Mahoney, MD, In Memoriam (1935-2021)

Dr. Mahoney graduated with honors from Franklin & Marshall College in Lancaster, Pennsylvania. He then attended Temple University in Philadelphia, PA where he graduated 4th in his class of 125. After medical school, Dr. Mahoney moved to Denver, Colorado and practiced for several years as an obstetrician/gynecologist. He then served for three years as a captain in the United States Army Medical Corps. During his time in the Army, Dr. Mahoney had the opportunity to testify as a treating doctor in a military court matter. This exposure sparked his interest in the law, and eventually he decided to attend law school. He graduated first in his class from Dickinson School of Law in Carlisle, Pennsylvania. He was a member of the law review and received several academic awards.

After law school, Dr. Mahoney moved back to Denver and entered private practice as a medical malpractice defense lawyer. As a partner at the law firm of Johnson & Mahoney, he defended doctors in malpractice cases for more than twenty years. In 1990, Dr. Mahoney established his own law firm and began representing victims of medical malpractice. His sons Paul and Kevin joined his firm in 1993 and 1995 respectively. Dr. Mahoney's excellence has been recognized by his peers as he has been listed in the book The Best Lawyers in America. Mahoney has been married to his wife Lavonne for 48 years. They have four sons and 13 grandchildren.

***Selected as a Super Lawyer in 2007-2018 in the Plaintiff Medical Malpractice category. Only 5% of attorneys are selected as Super Lawyers.***

In 2016, 2017, 2018, 2019 and 2020, Dennis was chosen by 5280 Magazine as one of only 7 attorneys in the state of Colorado as a Top Lawyer in the field of plaintiffs' medical malpractice. Less than 3% of the attorneys in the state were chosen as Top Lawyers. 2020 SuperLawyers selection in the field of Insurance Coverage.

He is a member of the Multi-Million Dollar Advocates Forum, which is limited to attorneys who, while acting as lead counsel, have achieved awards or settlements in excess of $2,000,000 for an individual client.

Dennis M. Mahoney, MD was selected among America's Top 100 High Stakes Litigators® for 2018. Selection to America's Top 100 High Stakes Litigators® is by invitation only and is reserved to identify the nation's most exceptional trial attorneys in high value, high stakes legal matters.

To be considered for selection, an attorney must have litigated (for either plaintiff or defendant) a matter (1) with at least $2,000,000 in alleged damages at stake or (2) with the fate of a business worth at least $2,000,000 at stake. These minimum qualifications are required for initial consideration. Thereafter, candidates are carefully screened through comprehensive Qualitative Comparative Analysis based on a broad array of criteria, including the candidate's professional experience, litigation experience, significant case results, representative high stakes matters, peer reputation, and community impact in order to rank the candidates throughout the state.

Only the top 100 qualifying attorneys in each state will receive this honor and be selected for membership among America's Top 100 High Stakes Litigators®. With these extremely high standards for selection to America's Top 100 High Stakes Litigators®, less than one-half percent (0.5%) of active attorneys in the United States will receive this honor - truly the most exclusive and elite level of attorneys in the community.

  • Medical Malpractice - Plaintiff
  • Brain Injury
  • Spinal Cord Injury
  • Birth Injury
  • Colorado, 1968
  • U.S. District Court District of Colorado, 1968
  • U.S. Court of Appeals 10th Circuit, 1998
  • Colorado Trial Lawyer's Association, Member
  • American Association for Justice, Member
  • American Bar Association, Member
  • American Medical Association, Member
  • Multi-Million dollar Advocates Forum, Life Member
  • The Dickinson School of Law, Carlisle, Pennsylvania
    • J.D.
    • Honors: summa cum laude
    • Honors: Graduated First in Class
  • Temple University
    • M.D.
  • Franklin & Marshall College, Lancaster, PA
    • B.S.
    • Honors: cum laude
    • Honors: With Honors
    • Major: Pre-Med
  • Sigma Chi
  • Pennsylvania's Captain of the Ship Doctrine: A Mid-Twentieth Century Anachronism, Dickinson Law Review, Vol. 71, p.432
  • Informed Consent to Surgery: Substitution of Patient's Subjective Understanding of Nature and Risks of Procedure for Objective Reasonable Man Test., A Critique of Gray v. Gunnagle, 423 Pa. 144. Cited in Dunham v. Wright 423 F.2d 943
  • Therapeutic Abortion: The Psychiatric Indication, a Double-Edged Sword, Dickinson Law Review, Vol. 72, p. 270
  • When a Signed Consent is not Enough, Medical Economics, Vol. 44, p. 41
  • Informed Consent to Surgery, Pennsylvania Medicine, Vol. 44, p. 41
  • Emergency Care and Transportation: Medicine and Legality, Association of Operating Room Nurses Journal, Vol. 12, No. 5, p. 42
  • The Experts Research Nursing Care and the Law, American Association of Operating Room Nurses Journal., May, 1971
  • Guest Lecturer, University of Denver College of Law, Denver, Colorado
  • Guest Lecturer, University of Colorado College of Law, Boulder, Colorado
  • Miles v. Box Butte County, d/b/a Box Butte General Hospital, 489 N.W. 2d 829, 1992, Supreme Court of Nebraska, 1992170153
  • Blades v. Dafoe, 704 P.2d 313, 1985, Supreme Court of Colorado, 1985134916
  • Selected to Super Lawyers (Plaintiff Medical Malpractice)
  • Best Lawyers in America
  • Top Lawyer 5280 Magazine
  • America’s Top 100 High Stakes Litigators® for 2018
  • Abel Klaw Scholarship Award
  • American Jurisprudence Award
  • Corpus Juris Secundum Award
  • Faculty Horn Book Award
  • Fellow of the American College of Legal Medicine
  • Walter Harrison Hitchler Award
  • 5280 Top Lawyer in the field of Medical Malpractice
  • Wormwood, Wolvington, Renner & Dosh, Denver, Colorado, Associate
  • Johnson & Kidneigh, Denver, Colorado, Associate
  • Johnson & Kidneigh, Denver, Colorado, Partner
  • Dennis M. Mahoney, M.D., J.D., Lakewood, Colorado, Partner
  • The Mahoney Law Firm, Lakewood, Colorado, Partner
  • United States Army Medical Corps., Captain
  • Fort Chaffee Army Hospital, Fort Smith, Arkansas, Assistant Chief OB/GYN Section
  • Fort Devons Army Hospital, Ayer, Massachusetts, Assistant Chief OB/GYN Section