Short answers, pulled from the story.
A Jewish Buddhist is a person of Jewish ethnicity who practices a form of Buddhism, with or without simultaneously observing Judaism. The term JewBu was introduced by Rodger Kamenetz in his 1994 book The Jew in the Lotus. Related self-descriptions include BuJews and BuddJews.
Rodger Kamenetz coined the term JewBu, also written JUBU, in his 1994 book The Jew in the Lotus. The book gave a widely recognized name to a demographic overlap that was already well established in American religious life.
Emily Sigalow estimated in her 2019 book American JewBu that ethnically Jewish Buddhists comprise between 16.5% and one-third of all non-Asian American Buddhists. This figure is drawn from demographic research on Buddhism in the United States.
Charles Strauss declared himself a Buddhist at the 1893 Parliament of the World's Religions, making him one of the earliest recorded instances of a Jewish person publicly identifying as Buddhist. He made the declaration after hearing talks by Buddhist delegates Soyen Shaku and Anagarika Dharmapala.
Joseph Goldstein, Jack Kornfield, and Sharon Salzberg, all Jewish Buddhists, founded the Insight Meditation Society, a Theravada-based institution. They primarily teach Vipassana meditation as transmitted by Thai teachers.
Notable Jewish Buddhists include poet Allen Ginsberg, musician Leonard Cohen, composer Philip Glass, historian Yuval Noah Harari, and Beastie Boys member Adam Yauch. Actors Goldie Hawn and Jeremy Piven, as well as Olympic athlete Anthony Ervin, are also identified as Jewish Buddhists.