Andrew Thomas Weil was born in Philadelphia, where his parents operated a millinery store. From the beginning, he was an academically gifted student, and on graduating high school, he won admission to Harvard University where he majored in biology. At Harvard, he studied with the pioneering ethnobotanist Richard Schultes, who ignited his interest in the medicinal plants used in traditional medicine around the world. As a student, Weil also demonstrated a nascent literary talent, serving as an editor of the daily campus newspaper, The Harvard Crimson, and the humor publication, The Harvard Lampoon. He graduated in 1964, with a degree in biology, concentrating in botany, writing his senior thesis on the narcotic properties of the common spice nutmeg.
Weil received his medical degree in 1968, and carried out an internship at Mt. Zion Hospital in San Francisco. The hospital served the Haight-Ashbury neighborhood, the center of the '60s counterculture at its height, and Dr. Weil had numerous opportunities to observe the effects of hallucinogens and addictive drugs. The following year, he accepted an offer from the National Institute of Mental Health, to direct a study of psychoactive drugs, but he felt constrained by the political atmosphere of Washington and soon returned to independent research. In 1971, Dr. Weil joined the staff of the Harvard Botanical Museum and received a fellowship from the Institute of Current World Affairs. He spent three years traveling throughout the Americas and Africa, studying the use of medicinal plants in the traditional practices of indigenous peoples.
Meanwhile, he continued his research, comparing the effects of organic compounds with synthetic pharmaceuticals. Noting that humans and plants evolved concurrently in the same environments, he came to believe that organic substances are more beneficially assimilated in the human body than synthetic ones. Dr. Weil sought to apply his discoveries by fusing the practices of alternative medicine with conventional medical practice in an approach he defined as "integrative medicine." Emphasizing nutrition, exercise and stress reduction to maintain the body's natural healing systems, he supports the use of conventional medicine for more radical intervention in the event of health crises. He presented these ideas to a general audience in Health and Healing: The Philosophy of Integrative Medicine (1983).
In 1983, Dr. Weil joined the faculty of the University of Arizona College of Medicine as a Clinical Professor, and also taught in the department of Family and Community Medicine. At the same time maintained a general medical practice in Tucson, focusing on natural and preventive medicine and diagnosis. In the following years, he established the Foundation for Integrative Medicine and served as Editor-in-Chief of the journal Integrative Medicine. In 1994, he founded the Program in Integrative Medicine at the University of Arizona in Tucson. Today, it is known as the Arizona Center for Integrative Medicine, and Dr. Weil serves as its Program Director. The center has trained hundreds of physicians, physician assistants and nurse practitioners in the techniques of integrative medicine.
Through Dr. Weil's books, and the success of the Arizona Center, his ideas have gained widespread acceptance, and integrative medicine programs have been established at dozens of institutions, including the Mayo Clinic, Georgetown, Duke and Columbia Universities, and at Dr. Weil's alma mater, Harvard Medical School. While he continues an active schedule of writing and public speaking, he also communicates directly with the general public through his popular web site feature, Ask Dr. Weil. He makes his home near Tucson, Arizona.