Robert Charles devoted his life to biblical research, and he became one of the primary
authorities of his time on matters of Jewish culture and theology, eschatology in
particular. In 1913, Charles published an English translation of the Apocryphal (or
Deuterocanonical) books of the Bible, including those not typically printed in Bibles
that include the Apocrypha. His translations of the Book of Enoch and the
Testaments of the Twelve Patriarchs especially are still widely used.