He later moved into the College itself, when he decided to enter the Ministry. His studies there were interrupted by the death of its principal, the Rev Barnett Abrahams. Singer was then fortunate to be taught by the new principal, Dr Michael Friedländer, who "took a kindly interest in young Singer". In 1867, whilst still a student, he became part-time minister, and combined this with teaching at the Day School, where he was for a time headmaster. He remained at Jews' College for 12 more years.