Denis Petro, M.D.

Founding Director

Education and activism since 1997 


Denis Petro, MD is a Founding Director of Patients Out of Time. Dr. Petro is a neurologist and has researched cannabis use for Multiple Sclerosis patients and has served as an expert witness for many cases concerning medical cannabis. Dr. Petro serves as a medical spokesperson and researcher for Patients Out of Time.

Science Based Education

Board-certified neurologist with over 30 years experience.

Congressional Advisor

Advised Congress in writing the Orphan Drug Act of 1983.

Cannabis Research

Conducted the first study of a cannabinoid (THC) in treatment of muscle spasms in spasticity.

Dr. Petro is a board-certified neurologist with over 30 years experience in pharmaceutical research and development and medical practice. He began his post-residency career at the FDA and conducted the FDA Advisory meeting which defined the use of aspirin as primary prevention of stroke and advised Congress in writing the Orphan Drug Act of 1983. He conducted the first study of a cannabinoid (THC) in treatment of muscle spasms in spasticity, While working with the pharmaceutical industry, he developed a number of drugs for treatment of Parkinson’s Disease, chronic pain, depression, cognitive impairment and seizure disorders. He testified in support of medicinal cannabis at the DEA Rescheduling Hearing in 1986 and consulted with the Institute of Medicine in preparation of the IOM report on Medical Marijuana in 1997. He has been recognized as an expert in neurology and pharmacology by both the state and federal court systems of the USA, as well as in Canada and the United Kingdom.

Denis Petro, Founding Director
Mary Lynn Mathre, President

Mary Lynn Mathre, President

Producing accredited educational seminars for health care professionals since 1995.About Mary Lynn (ML) Mathre is the President and Co-founder of Patients Out of Time and Past President and Founding Member of the American Cannabis Nurses Association (ACNA). Mary Lynn...

Melanie Dreher, RN, PhD, FAAN

Melanie Dreher, RN, PhD, FAAN

Distinguished research examining the health and development of women and children in Jamaica About Dr. Dreher is Dean Emeritus of the College of Nursing of Rush University in Chicago, Illinois. From 1997 until 2006 she served as Dean of the University of Iowa College...

Michael Jay Green, Treasurer

Michael Jay Green, Treasurer

Navy veteran, bookseller, attorney and all around eclectic cannabis renaissance man About Michael Jay Green serves of the Board of Patients Out of Time as its treasurer and on the membership, events & legal committees. He is also active as a member of the Board of...

Jon Gettman, PhD

Jon Gettman, PhD

Education, Criminal Justice & Activist.About Jon Gettman is an Associate Professor of Criminology and Criminal Justice at Shenandoah University.  He is best known in the medical cannabis community for his work on two unsuccessful efforts to have cannabis...

Scheril Murray Powell, Esq

Scheril Murray Powell, Esq

Education, Criminal Justice & Activist.About Scheril Murray Powell, Esq. is an Agricultural, Cannabis, and Dietary Supplement Attorney at Doumar, Allsworth, Laystrom, Voigt, Adair, and Dishowitz LLP.   The Daily Business Review has named her one of the Top 12...

Irvin Rosenfeld

Irvin Rosenfeld

The second patient of the Compassionate Invesitgational New Drug program.About The longest surviving of the final four Federal Medical Cannabis patients in the United States. The Federal Government has been supplying me 10 Medical Cannabis cigarettes per day for over...

Brandon Wyatt, Esq

Brandon Wyatt, Esq

Decorated army combat solider, disabled veteran, activist and attorney.About Attorney Brandon L. Wyatt Esq., a decorated army combat solider and disabled veteran, is admitted to practice law in the state of Maryland. He received his Juris Doctorate from Howard...


George McMahon, Founding Director
Larry Hirsch, JD (Advisor)
Joanna McKee (Advisor)
Robert Randall (Advisor)
Tom Saint, (Advisor)
Barbara Douglass (Board member)
Mae Nutt (Board member)
Kevin Zeese, Esq.


Dr. Dustin Sulak  |  Sunil Kumar Aggarwal, MD, PhD  |  David Bearman, MD  |  Richard Bonnie, JD  |  Sandee Burbank  |  Ervin Dargan  |  Patrick Fourmy  |  Greta Gaines  |  Mara Gordon  |  Michael Krawitz  |  Bryan Krumm, RN  |  Laura Lagano, MS, RDN, CDN  |  Jim Miller  |  Mark Miller  |  Carl Olsen  |  Mark Pedersen  |  Angel Raich  |  Alice O’Leary Randall, LPN  |  John Rowlingson, MD  |  Ethan Russo, MD  |  Gary Storck  |  Mark Ware, MD, MSc, MRCP  |  Lennice Werth |  Don Wirtshafter, Esq.  |  Ken Wolski, RN, MPA


Al Byrne  |  Michael Aldrich, PhD. |  Elvy Musikka, IND Patient 


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