Though many details about his early life are in dispute, scholars agree that Arnold was born in New York City and that his father may have been the Reverend George B. Arnold. The family relocated to Illinois and then to Monmouth County, New Jersey where Arnold enjoyed a country upbringing. Though he apprenticed himself to a portrait painter in New York in 1852, Arnold soon determined that literature would be his true calling.
Born in County Cork and raised primarily in Limerick, Ireland, Fitz-James O'Brien moved to New York City in 1852. Descending from an Anglo-Irish landholding family, O'Brien received his inheritance (estimated at £8000) at about the age of 21. Between 1849 and 1851, it is believed that O'Brien edited a failed literary magazine called The Parlour Magazine of the Literature of All Nations and squandered his inheritance (Wolle 21). Leaving England almost penniless, O'Brien immigrated to America and made the U.S.
Born in northern New York state, Charles Henry Webb, also known in the literary world as "John Paul" was a journalist and poet. As a young man Charles Henry Webb left his parents' home and spent three years at sea. When he returned to the United States, Web lived in New York City and worked as a journalist for the New York Times before moving to California where he wrote for the San Francisco Bulletin and edited The Californian.