In 1839, he joined William Ticknor and became junior partner in the publishing and bookselling firm known after 1845 as Ticknor and Fields. Ticknor oversaw the business side of the firm while Fields was its literary expert. He became known for being likable, for his skill at finding creative talent, and for his ability to promote authors and win their loyalty. With this company, Fields became the publisher of leading contemporary American writers, with whom he was on terms of close personal friendship. He was also the American publisher of some of the best-known British writers of his time, some of whom he also knew intimately. The company paid royalties to these British authors, including Charles Dickens and William Makepeace Thackeray, at a time when other American publishers pirated the works of those authors. The first collected edition of Thomas de Quincey's works (20 vols., 1850–1855) was published by his firm. Ticknor and Fields built their company to have a substantial influence in the literary scene which writer and editor Nathaniel Parker Willis acknowledged in a letter to Fields: "Your press is the announcing-room of the country's Court of Poetry."