Jonathan Treasure is an English medical herbalist currently resident in the town of Ashland, in what is sometimes known as the mythical State of Jefferson (Southern Oregon-Northern California).

Jonathan was originally educated at King's College, Cambridge, graduating with a Masters in medical sciences in 1973. Disillusioned with both mainstream clinical medicine, and medical research (at Harvard Medical School in neurosciences) he abandoned conventional medicine for the study and practice of Tibetan buddhism, and then began to explore traditional herbal medicine. He subsequently graduated from the original UK School of Phytotherapy (Herbal Medicine), Sussex, England, under the late Hein Zeylstra. He was elected a Member of the prestigious UK National Institute of Medical Herbalists (MNIMH); he is also a member of the College of Practitioners of Phytotherapy (MCPP).

After moving to the Pacific Northwest from England in 1994 he become a professional member of the American Herbalists Guild (AHG). He has published in several journals and is Senior Editor of the Journal of the American Herbalists Guild,as well as a contributor and reviewer for The American Herbal Pharmacopoeia in pharmacology and therapeutics. He is a member of the Scientific and Medical Advisory Board of Life Extension Foundation.

He has taught herbal medicine, pharmacology, and therapeutics at several schools in the US, including Michael Moore's South West School of Botanical Medicine in Arizona, The National College of Phytotherapy in New Mexico, The Rocky Mountain Center for Botanical Studies in Colorado, The National College of Naturopathic Medicine, Portland, Oregon, and Bastyr University Seattle, Washington; he regularly lectures and at professional level seminars and symposia throughout the US.

A recognised authority on herb-drug interactions, he is co-author of Interactions™ a CD-ROM database of herb-drug and herb-nutrient interactions, and is currently working on forthcoming textbook (Mosby, 2007) on the subject. He teaches on herb-drug interactions not only to herbal practitioners, but as CME for to pharmacists, naturopathic physicians and allied healthcare professionals.

A long time buddhist, he offers patients a rare combination of western herbalism and modern biomedical science within an integrative framework that includes an awareness of the role of spiritual well-being in health, together with a commonsense attitude and with a serving size portion of English humor.

His clinical approach focuses on incorporating botanical medicine and nutritional therapies into integrative strategies for people challenged by cancer. He trained s a Cancer Guide with Dr Jim Gordon's Center for Mind Body Medicine, and currently works Centre For Natural Healing where he collaborates with fellow herbalist and cancer specialist Donnie Yance. For several years he has been developing a protocol for the use of artemesinin (derived from Artemisia annua) and developing botanical formulae to be utilized with different chemotherapies, to increase efficacy and reduce side-effects of conventional treatments.

Generally reclusive, he can often be found on a lightweight bicycle around the Oregon countryside, trying to figure out how the common English roadside weeds grew so huge in America.

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