Édouard Cointreau was a French entrepreneur known for his role in the family business, Cointreau, a famous liqueur brand. Founded in 1849, the company specializes in producing orange liqueur, particularly the well-known Cointreau orange liqueur, which is used in various cocktails. Cointreau was instrumental in expanding the brand's reach and popularity, especially in the United States during the early 20th century. His efforts helped establish Cointreau as a key ingredient in classic cocktails like the Margarita and Cosmopolitan, contributing to the global appreciation of this distinctive liqueur.