 He then taught various subjects, including mathematics, Latin, Ancient Greek, rhetoric, and the humanities in Massachusetts, New York City, and Washington, D.C., and served as minister at many of the institutions there.During his four-year leadership of Georgetown University, he oversaw several construction projects, the largest of which were the demolition of Old South Hall and its replacement with Ida Ryan Hall, and the construction of Hirst Library inside Healy Hall.He also continued his predecessor's work of reforming the curriculum, and managing tensions with the Catholic University of America.