Seven years later, he joined the firm of Henderson and Hooker, who were involved in transporting goods and passengers along the St. Lawrence and lower Great Lakes; in 1845, he became a senior partner in the firm, now Hooker and Holton, on Henderson's death.
Seven years after joining the firm of Henderson and Hooker, which handled transportation on the St. Lawrence and lower Great Lakes, he became a senior partner in the firm, Hooker and Holton, following Henderson's passing in 1845.