Joan Jiko Halifax is an American Zen Buddhist teacher, anthropologist, ecologist, civil rights activist, hospice caregiver, and the author of several books on Buddhism and spirituality. She currently serves as abbot and guiding teacher of Upaya Zen Center in Santa Fe, New Mexico, a Zen Peacemaker community which she founded in 1990. Halifax has received Dharma transmission from Bernard Glassman, and previously studied with the Korean zen master Seung Sahn. In the 1970s she collaborated on LSD research projects with her ex-husband Stanislav Grof, in addition to other collaborative efforts with Joseph Campbell and Alan Lomax. She is founder of the Ojai Foundation in California, which she led from 1979 to 1989. As a socially engaged Buddhist, Halifax has done extensive work with the dying through her Project on Being with Dying. She is on the board of directors of the Mind and Life Institute, a non-profit organization dedicated to exploring the relationship of science and Buddhism.

The Zen Peacemakers is a diverse network of socially engaged Buddhists, currently including the formal structures of the Zen Peacemakers International, the Zen Peacemaker Order and the Zen Peacemaker Circles, many affiliated individuals and groups, and communities formed by Dharma Successors of Roshi Bernie Glassman. It was founded by Bernie Glassman and his second wife Sandra Jishu Holmes in 1996, as a means of continuing the work begun with the Greyston Foundation in 1980 of expanding Zen practice into larger spheres of influence such as social services, business and ecology but with a greater emphasis on peace work. Eve Marko, Bernie Glassman's third wife, is a founding teacher of the Zen Peacemaker Order. Zen Peacemakers have developed from the White Plum Asanga lineage of Taizan Maezumi.