Jack Kornfield (born 1945) is a bestselling American author and teacher in the vipassana movement in American Theravada Buddhism. He trained as a Buddhist  monk in Thailand, Burma and India, first as a student of the Thai forest master  Ajahn Chah and Mahasi Sayadaw of Burma. He has taught meditation worldwide since 1974 and is one of the key teachers to introduce Buddhist Mindfulness practice to the West. In 1975, he co-founded the Insight Meditation Society in Barre, Massachusetts, with Sharon Salzberg and Joseph Goldstein, and subsequently in 1987, Spirit Rock Meditation Center in Woodacre, California. Kornfield has organized teacher training and led international gatherings of Buddhist teachers including the Dalai Lama and has worked as a peacemaker and activist.
Kornfield is one of four boys
born to Jewish parents.  He is a fraternal twin.
After graduating from
Dartmouth College in Asian Studies in 1967, Kornfield joined the  Peace Corps and was sent to Thailand. There he met and became a monk under the renowned forest master  Ajahn Chah, and later practiced with Mahasi Sayadaw of Burma and  Dipa Ma. Kornfield returned to the United States in 1972 and, in the summer of 1974, participated in the founding session of Naropa Buddhist University. From the associations of this period came the  Insight Meditation Society, co-founded in 1975 with Sharon Salzberg and Joseph Goldstein in Barre, Massachusetts. In 1987 he co-founded Spirit Rock Meditation Center in Woodacre, California.
Kornfield has trained many of the Vipassana teachers in America, and hosted and led gatherings for Buddhist teachers together with the Dalai Lama and worldwide. Trained with a Ph.D. in
clinical psychology from Saybrook Institute, Kornfield has written extensively on the bridge between Eastern and Western psychology.
His daughter Caroline is a graduate of Berkeley Law
and practices Asylum Law. His ex-wife Liana is an artist and therapist.  His wife Trudy Goodman  is also a renowned meditation teacher and the founding teacher of InsightLA. 
Kornfield has worked to make Buddhism accessible for Westerners.
He has focused on combining loving kindness and self compassion with the practice of mindfulness, and incorporating together the wisdom of Eastern and Western psychology.
In Jack Kornfield's book
After the Ecstasy, the Laundry, he writes about the honest development of the wise heart within the cycles of day-to-day life; for instance "amid all the Western masters and teachers I know, some idealistic perfection is not apparent. Times of great wisdom, deep compassion, and a real knowing of freedom alternate with periods of fear, confusion, neurosis, and struggle. Most teachers will readily admit this."
Kornfield sells online meditation courses from his web site.
His books include
Kornfield, Jack (2017). . [Atria Books, Inc. No Time Like The Present Finding Freedom and Joy Right Where You Are ISBN . 978-1-4516-9369-0
Kornfield, Jack (2011). . Bringing Home the Dharma: Awakening Right Where You Are Shambhala Publications, Inc. ISBN 978-1-59030-913-1 . Retrieved . May 15, 2015
Kornfield, Jack (2011). . Sounds True. A Lamp in the Darkness: Illuminating the Path Through Difficult Times ISBN 978-1-60407-642-4 . Retrieved . May 15, 2015
Kornfield, Jack (2010). . Shambhala Publications, Inc. The Buddha is Still Teaching: Contemporary Buddhist Wisdom ISBN 978-1-59030-922-3 . Retrieved . May 22, 2015
Kornfield, Jack (May 1, 2008). . Bantam Dell. The Wise Heart: A Guide to the Universal Teachings of Buddhist Psychology ISBN 978-0-553-80347-1 . Retrieved . April 20, 2015
Kornfield, Jack (2008) . . Sounds True. Meditation for Beginners ISBN 978-1-59179-942-9 . Retrieved . May 16, 2015
Kornfield, Jack; Fronsdal, Gil (1996) . . Shambhala. The Teachings of the Buddha: Edited by Jack Kornfield with Gil Fronsdal ISBN 1-57062-124-1 . Retrieved . May 16, 2015
Kornfield, Jack (October 2, 2001). . Random House Publishing Group. After the Ecstasy, the Laundry: How the Heart Grows Wise on the Spiritual Path ISBN 978-0-553-37829-0 . Retrieved . June 6, 2011
Goldstein, Joseph; Kornfield, Jack (March 6, 2001). . Shambhala. Seeking the Heart of Wisdom: The Path of Insight Meditation ISBN 978-1-57062-805-4 . Retrieved . June 6, 2011
Goldstein, Joseph; Kornfield, Jack (August 29, 1995). . Shambhala. The Path of Insight Meditation ISBN 978-1-57062-069-0 . Retrieved . June 6, 2011
Kornfield, Jack (June 1, 1993). . Bantam Books. A Path with Heart: A Guide through the Perils and Promises of Spiritual Life ISBN 978-0-553-37211-3 . Retrieved . June 6, 2011
Feldman, Christina; Kornfield, Jack (1991). . HarperSanFrancisco. Stories of the Spirit, Stories of the Heart: Parables of the Spiritual Path from Around the World ISBN 978-0-06-250321-3 . Retrieved . June 6, 2011
Kornfield, Jack; Breiter, Paul (September 1, 1985). . Quest Books. A Still Forest Pool: The Insight Meditation of Achaan Chah ISBN 978-0-8356-0597-7 . Retrieved . June 6, 2011 Kornfield, Jack (1996) . . Shambhala Publications, Inc. Living Dharma: Teachings and Meditation Instructions from Twelve Theravada Masters ISBN 978-1-59030-832-5 . Retrieved . May 17, 2015
Kornfield lectures were featured by
Joe Frank on his radio series "The Other Side."
Elliott, William (March 1, 1996). . Image Books. p. 215. Tying rocks to clouds: meetings and conversations with wise and spiritual people ISBN 978-0-385-48191-5 . Retrieved . June 6, 2011 So before my interview with Jack Kornfield, who is a well-known Vipassana meditation teacher, I was concerned about not
"About". Jack Kornfield. Archived from the original on August 12, 2015 . Retrieved . August 20, 2015
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Silberman, Steve (September 1, 2010). "Wise Heart: A profile of Jack Kornfield" . Retrieved . September 10, 2015
"Finding My Religion / Buddhist teacher and author Jack Kornfield on mindfulness, happiness and his own spiritual journey". SF Gate. November 28, 2005 . Retrieved . September 11, 2015
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"About". Jack Kornfield. Archived from the original on December 22, 2013 . Retrieved . December 21, 2013
Kornfield, Jack (2008). The Wise Heart. Bantam Books. p. 76. ISBN . 9780553382334
Palmer, Helen (December 28, 1998). . J.P. Tarcher/Putnam. p. 202. Inner knowing: consciousness, creativity, insight, and intuition ISBN 978-0-87477-936-3 . Retrieved . June 6, 2011 Regardless of its level of complexity, every practice relies on steadiness of concentration. Jack Kornfield, psychologist and meditation teacher, describes the practice that forms a cornerstone of …
"Dharma teachers Trudy Goodman and Jack Kornfield to tie the knot". Lion's Roar. April 20, 2016 . Retrieved . April 20, 2016
"About InsightLA". InsightLA . Retrieved . April 20, 2016
Grof, Stanislav (June 2006). . Sounds True. p. 235. When the Impossible Happens: Adventures in Non-Ordinary Reality ISBN 978-1-59179-420-2 . Retrieved . June 6, 2011 Coleader of the workshop was Jack Kornfield, dear friend, psychologist, Vipassana teacher, and Buddhist monk, who taught participants the principles of insight meditation, gave lectures on Buddhism, offered personal darshans, …
Kornfield, Jack (2001). After the Ecstasy, the Laundry: How the Heart Grows Wise on the Spiritual Path. Random House. p. xix. ISBN . 9780553378290