As early as 1904, Chodziesner assisted Magnus Hirschfeld in legal matters. After an opinion poll among students as to their sexual orientation, he defended Hirschfeld who had been accused of insulting the students with the questionnaire.
In 1918, he was one of the three founders of the Hirschfeld-Foundation and a member of the "Scientific-humanitarian Committee" (Wissenschaftlich-humanitäres Komitee). He remained a member of the Foundation's board as the Institute's legal adviser until the end of 1923. At the same time, he had his own law practice in Berlin.