Leighton's father was a medical school professor and cancer researcher, his mother a high school French teacher and librarian. Leighton began his Zen practice in 1975 at the New York Zen Center, training under Kando Nakajima
rōshi. He studied at
Columbia University, where he obtained a
bachelor's degree in East Asian studies. Leighton worked as a television and film editor in
New York City, and then San Francisco. In 2000, Leighton received
shihō, or Dharma transmission, from Reb Anderson. part of the Berkeley
Graduate Theological Union, from which Leighton has a
Ph.D. degree. Leighton has been involved in many interfaith dialogue programs, including conducting Buddhist–Christian dialogue workshops. He has long been active in various
Engaged Buddhist programs for social justice, including Environmental and Peace activism. Leighton's peace activism goes back to dedicated anti-Vietnam War work in high school, and he was then as a College freshman arrested as part of the 1968 week-long building occupation at Columbia University protesting the War and racism. In 2007 Leighton relocated to Chicago to serve full-time as Guiding Dharma Teacher for Ancient Dragon Zen Gate, which he had founded with students there a few years before. In 2008 Leighton performed
Zuisse ceremonies at Eiheiji and Sōjiji temples in Japan to be recognized as a Dharma teacher by the Japanese Sōtō School. In 2019 Leighton completed Dharma transmission ceremonies at Ancient Dragon Zen Gate for his Dharma heirs Nyozan Eric Shutt and Eishin Nancy Easton. ==Professorships==