Leslie W. O'Leary, Attorney

Leslie O'Leary Lawyer

Leslie W. O'Leary update listing

Litigation, Accident & Injury, General Practice


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Leslie O'Leary has been involved in mass tort litigation for over 15 years, including her work before and since attending law school. Prior to joining WLO&P, Ms. O'Leary worked as commercial real estate appraiser, and later, as a paralegal in the Lincoln Savings MDL and was a member of the trial team in Tucson, Arizona. After joining the firm in 1992, she supervised the national discovery of millions of documents and assisted with dozens of depositions in the silicone breast implant MDL. Ms. O'Leary continued to do legal research and prepare breast implant cases for trial during law school.

A native Montanan, Ms. O'Leary graduated cum laude from the University of Montana in 1982. Ms. O'Leary received her law degree in 1998 from Northwestern School of Law at Lewis and Clark College. She was admitted to the Oregon State Bar in 1999 and is also admitted to practice in the U.S. District Court of Oregon.

After law school, Ms. O'Leary took a lead role in the Fen-phen litigation. She was involved in document review and depositions in the MDL. She also represented over 200 Oregon and Washington clients, arguing motions and preparing their cases for trial. She worked with attorneys in other states to assist an additional 2,000 people injured by these diet drugs.

Since then, Ms. O'Leary was appointed to the Phenylpropanolamine (PPA) Discovery Committee, as well as the Science and Expert Committee. She reviewed documents, took depositions, and was part of the team that briefed and argued the Daubert motions in the MDL. Ms. O'Leary also represented several PPA clients in Oregon and around the country in their individual lawsuits.

In 2003, Ms. O'Leary was elected co-chair of the AAJ Ephedra Litigation Group. She currently represents people injured by dietary supplements containing ephedra. She also represents individuals who have suffered strokes and cardiac failure as a result of ephedra use. She is also Treasurer of the AAJ Section on Toxic and Environmental Torts.

In May 2004, Ms. O'Leary was appointed to the national Ephedra MDL Plaintiffs Coordinating Committee. She is one of eight members who manage the pretrial discovery for all cases in the Ephedra MDL. Ms. O'Leary authored the MDL plaintiffs' Daubert briefs on admissibility of expert testimony and successfully argued these motions before the court.

Ms. O'Leary is also a member of the national Prempro MDL Discovery, Science and Law Committees in the Prempro MDL. She was instrumental in defeating challenges to the admissibility of scientific expert testimony on causation and has been a trial team member in three several bellwether hormone therapy cases.

In addition, Ms. O'Leary currently serves on the Executive Committee of the American Association for Justice Section on Toxic, Environmental & Pharmaceutical Toxic Torts ("STEP").

Ms. O'Leary is a member of the Board of Governors for the Oregon Trial Lawyers Association. She also serves on the board of Oregon Women Lawyers and the Oregon State Bar Products Liability Section Executive Committee. In 2006, Ms. O'Leary was appointed to the Oregon State Bar's Council on Court Procedures. In addition, she is a member of the American Association for Justice, Trial Lawyers for Public Justice, the Federal Bar Association, and the American Bar Association. She also enjoys mentoring new law school students at Northwestern School of Law.

Ms. O'Leary regularly lectures colleagues and law students on legal topics such as federal preemption, admissibility of expert testimony under Daubert and other issues of importance to the right to trial by jury. In May of 2006, Ms. O'Leary was invited to the Sedona Conference, Litigating Mass Torts as a panelist, along with several esteemed judges and lawyers. Ms. O'Leary recently completed a chapter on expert witnesses for the Oregon State Bar publication entitled Federal Civil Litigation in Oregon.

She has spoken at several national conferences regarding mass tort litigation and has presented at continuing education classes for attorneys in Oregon. Beyond her practice as litigator, Ms. O'Leary has authored such works as: "Mass Tort Class Actions: Will Amchem Spawn Creative Solutions?" Defense Counsel Journal, October 1998; "Kumho Tire in Oregon: Should it Apply?" Trial Lawyer , Summer 2000; and "Pharmaceutical Mass Torts: A High Stakes Game" Trial Lawyer , Winter, 2002; "In pursuit of Ephedra: The Challenges of Pharmaceutical Mass Torts, Trial Lawyer, Spring, 2006; "The Fraud of Hormone Therapy: How Drug Companies Manipulated Women, Trial Lawyer, Spring, 2006; "Less than perfect Evidence: The Collision of Science and Law Under Daubert," Oregon State Bar Products Liability Newsletter , Winter 2006; "Does FDA Regulation of Drug Labeling Preempt State Law Failure to Warn Claims? A Point/Counter-Point," Oregon State Bar Products Liability Newsletter, Spring 2007.

Position Organization Location Duration
School Degree Major Graduation
Lewis & Clark Law School Law SchoolN/A  
University of Montana
State / Court
Sun. Mon. Tue. Wed. Thu. Fri. Sat.


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Leslie W. O'Leary
9755 S.W. Barnes Road
Suite 450
Portland, OR 97225
45.500519,-122.779164

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9755 S.W. Barnes Road
Suite 450
Portland, OR 97225


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