His older brothers were Josef, and František Langer who was a successful playwright, legionnaire and military doctor.

At age 19, Langer travelled to Belz to join the Hasidic movement of Yissachar Dov Rokeach.

During this time he deepened his studies of Torah, Talmud, Midrash, and Kabbalah and lived the hasidic life together with the community.

During this time he published Die Erotik der Kabbala, under the influence of Sigmund Freud in which he combined Jewish mysticism with psychoanalysis; in particular, he was looking for a connection with erotic symbolism.

Man does not control his actions in a deeper sense at all and acts as if in a dream from which he cannot wake up, although prophets, mystics, poets and philosophers try to do so.

"To write this book, my brother Jiří Langer had to transport himself from the living reality of the twentieth century into the mystical and ecstatic atmosphere of the Middle Ages.

Nor could this be effected merely in a metaphorical way, on the wings of fantasy... Jiří found himself five hundred kilometers away to the east, and simultaneously two or even five centuries back in time."

The famed writer Isaac Bashevis Singer, in a review of the book wrote "The reader need not make his way through scholarly introductions, sociological theories, historical analyses.

This lasted until February 1940, when with the help of Czech compatriots they landed in Romania and with the intervention of the ambassador to the British government, they were rescued and transported to Istanbul.

The Nine Gates Festival of Czech-German-Jewish Culture took place in Prague on an annual basis for many years [4][5] Pavel Dostal the Czech Cultural Minister said the Nine Gates Festival reminded citizens of the 1,000-year history of the Jewish people in Czech lands, of “its vitality, its wisdom and creative potential, and its significant contribution to Czech culture.”[6][7] In 2011 LGBT historian Shaun Jacob Halper published an article in the Jewish Quarterly Review entitled Coming out of the Hasidic closet: Jiří Mordechai Langer (1894–1943) and the fashioning of homosexual-Jewish identity which uses Langer's 1923 book Die Erotik der Kabbala to "contextualize this long-neglected text within Langer's fascinating biography; the debates in the early homosexual rights movement; the particular cultural features of the 'Prague circle' in which Langer wrote.