In 1803, at age 16, Cushing sailed for
China to become clerk in his uncle's
counting house. The head of the firm in China soon fell ill and died at sea. Thus, when Cushing arrived in China, he found himself Perkins & Company's sole agent, remaining there for nearly 30 years. Cushing was said to have managed the affairs of the firm skillfully and was soon taken into partnership. Under Cushing, the firm of Perkins & Company was formally established in Canton in 1806. They imported and traded rice during a famine in China and during the
War of 1812, the family loaned their money out, at an interest rate of 18 percent, to other merchants in Canton. When the fur trade diminished they began searching for a substitute for what had once been the foundation of Boston's China trade. The firm focused on
opium and, by the 1820s, Cushing was known as the most influential of all the foreigners in Canton, having struck up a close relationship with the merchant
Howqua, who at his death in 1843 was said to be the richest man in the world. In 1820, Cushing brought on his cousin,
Thomas Tunno Forbes, to train for the business. Forbes, however, died in 1827 before assuming control of the firm. Cushing, eager for retirement and lacking a suitable replacement, made arrangements to dissolve Perkins & Company by a consolidation with Russell & Co. in 1830. Russell & Co. had been created by China trader
Samuel Russell in 1824. In 1830, Cushing returned to Boston with Eastern manners and manservants. ==Personal life==