In 1972, Ferro joined the faculty of the Juilliard School, a post he held until his retirement as "vocal faculty emeritus" in 2006, although he has continued to give master classes there.
Ferro joined the faculty of the Juilliard School. This was in 1972. The Juilliard School was a post. Although he has continued to give master classes there. This was what he held a post until his retirement as "vocal faculty emeritus" in 2006.