Rev. Dr. Leslie Rumble, M.S.C. was brought up by Anglican parents and was a Protestant in his early years. After some thirty years, he became a Catholic, and eventually became a priest of the Missionaries of the Sacred Heart.
In 1928, Fr. Rumble began a one-hour "Question Box" program on 2SM Sydney, N.S.W. radio on Sunday evenings. He hosted the program for five years, answering questions that had been written to him from around the glove.
He collaborated with Fr. Charles Mortimer Carty on a series of books, Radio Replies. The first edition was issued in Australia in the summer of 1937, financed by Msgr. James Meany, P.P., the director of 2SM.