John Charles Martin was a newspaper publisher who, beginning in 1913, ran the newspapers purchased by his step father-in-law Cyrus Curtis, including the Public Ledger, the New York Evening Post, the Philadelphia Inquirer and four others. In 1931, an insurance industry magazine published a listing of Americans carrying the greatest amount of life insurance; Martin was second on the list with $6,540,000 in insurance, after Pierre Samuel du Pont with $7 million.  Martin's former estate in Wyncote, Pennsylvania now houses the Reconstructionist Rabbinical College.
- ^ Anonymous. After Curtis. Time, Monday, Jul. 17, 1933. 
- ^ Anonymous (17 March 1930). "Again, Curtis-Martin". Time. Retrieved 2008-04-12.
- ^ Anonymous. Names make news. Time, Monday, Sep. 21, 1931.