The most explosive growth was experienced in Chabad-Lubavitch, whose head, Menachem Mendel Schneerson, adopted a modern (he and his disciples ceased wearing the customary Shtreimel) and outreach-centered orientation. At a time when most Orthodox Jews, and Hasidim in particular, rejected proselytization, he turned his sect into a mechanism devoted almost solely to it, blurring the difference between actual Hasidim and loosely affiliated supporters until researchers could scarcely define it as a regular Hasidic group. Another phenomenon was the revival of Breslov, which remained without an acting "Tzaddiq" since the rebellious Rebbe Nachman's 1810 death. Its complex, existentialist philosophy drew many to it.