From 1765 to 1767 and from 1769 to 1775 Sonnenfels was editor of "Der Mann ohne Vorurtheil", in which paper he defended the liberal tendencies in literature.
V rokoch 1765 až 1767 a neskôr v rokoch 1769 až 1775 vydával svoj denník "Der Mann ohne Vorurtheil" v ktorom obhajoval liberálne tendencie v literatúre.