Neo-Hasidism is a name given to contemporary Jewish trends of a significant fusing or revival of interest in the teachings of Kabbalah and Hasidism by members of other existing Jewish movements. Among non-Orthodox Jews, this trend stems from the writings of non-Orthodox teachers of Hasidic Judaism like Martin Buber, Abraham Joshua Heschel, Lawrence Kushner, Zalman Schachter-Shalomi and Arthur Green. This is usually associated with the members of the Jewish Renewal movement. A second form of this trend is found within the Modern Orthodox Jewish community, and is referred to as Neo-Chassidus, involving those who are Modern Orthodox but have taken interest in the works of Hasidic masters.
Martin Buber helped initiate interest in Hasidism among modernized Jews through a series of books he wrote in the first decades of the 20th century, such as Tales of the Hasidic Masters and the Legend of the Baal Shem Tov. In these books, Buber focused on the role of story telling and the charisma of early Hasidic masters as a vehicle for personal spirituality. As such, these books represent one aspect of Buber's larger project of creating a new form of personalistic, existential religiosity. Buber came under considerable criticism, especially from younger contemporary Gershom Scholem, for having interpreted Hasidism in an eccentric way that misrepresented Hasidic belief and literature. Nevertheless, Buber's sympathetic treatment of Hasidism proved attractive to many and started the 20th century romance between (idealized) Hasidism and non-Orthodox Jews.
Following World War II, when the Hasidic centers of Central and Eastern Europe were decimated, some of the surviving communities relocated to America, creating new opportunities for American Jews to have direct experience with them, their practices and their beliefs. Most of these communities remained determinedly insular, but a few, primarily the Chabad and Bratslav (or Breslov) Hasidim, adopted an attitude of outreach to the larger Jewish community, seeking to win more Jews to the Hasidic way of life. In the 1960s the Lubavitcher Rebbe (Menachem Mendel Shneerson) started commissioning young Chabadniks to seek out and teach young secular and religiously liberal Jews. Two of the early "shluchim" were Zalman Schachter-Shalomi and Shlomo Carlebach. While Carlebach, a charismatic singer who used music as his tool, stayed (largely) within the circle of the Orthodox community from which he arose, Schachter-Shalomi charted an increasingly independent course, leaving Chabad to eventually study at Hebrew Union College (HUC), the leading academic institution of Reform Judaism, and to found what became Jewish Renewal.