 He was greatly influenced by the mussar movement approach he chiefly absorbed in Kelm, but also in Slobodka and by means of his contact with Horowitz in Slonim.After four years of studying in Kelm, Trop was appointed "rosh yeshiva" of the "Or HaChaim" yeshiva in Slabodka, by its founder, Tzvi (Hirshel) Levitan.In 1903, by invitation of Yisrael Meir Kagan, Trop replaced Rabbi Moshe Landinski as "rosh yeshiva" in Raduń, where he remained for the rest of his life.