一口通商
In 1753 he joined the trading house. He journeyed to China twice in 1755 and 1761. (In between he lived in France.) He lived in Canton as well as Macao for eight years. He was the representative in Canton for the SOIC, because of the Canton System. Since 1732 Swedish merchants traded in Canton now known as Guangzhou. He also had two trading companies, one together with Michael Grubb, trading with the countries close to China, and one of his own, which he used for trading tea and smuggling opium from India to China.