Jan Hendrik Frederik Grönloh was born in Amsterdam, the oldest of four children. After an idealistic youth, he joined the Holland–Bombay Trading Company in 1904, becoming director in 1926, suffering a nervous breakdown leading to a short hospitalization in 1927, and retiring at age fifty-five, on December 31, 1937; he married Aagje Tiket (b. 1883) in 1906 and had four daughters with her, born in 1907, 1908, 1909, and 1912. Meanwhile, as Nescio (Latin for “I don’t know”; he adopted a pseudonym so as not to jeopardize his business career, acknowledging his authorship publicly only in 1929), he wrote what is now considered perhaps the best prose in the Dutch language.