After graduating from college, Stevens entered mercantile life, and became a partner in his father's business in 1818. He was for many years secretary of the
New York Chamber of Commerce, and one of the organizers and the first president of the Merchants' Exchange. From its first establishment in 1839 until 1866, he was president of the
Bank of Commerce. He was a
Whig in politics, but an earnest advocate of low tariffs. He was chairman of the committee of bankers of New York,
Boston, and
Philadelphia which first met in August 1861, and decided to take $50,000,000 of the government 7.30 loan. They subsequently advanced $100,000,000 more, and the terms of the transactions were arranged chiefly by Stevens, as the head of the treasury note committee. His advice was frequently sought by the officers of the
United States Department of the Treasury during the
American Civil War. For many years, Stevens was a governor of the
New York Hospital, and took an interest in other benevolent institutions. ==Personal life==