Epsilon is a marketing company that provides data-driven marketing solutions to brands. The company was founded in 1969 and is headquartered in Irving, Texas. Epsilon offers a range of services, including email marketing, loyalty marketing, digital marketing, and data analytics. The company has over 8,000 employees and serves clients in various industries, including retail, financial services, healthcare, and automotive. Epsilon is a subsidiary of Publicis Groupe, a global advertising and communications company.