Pfizer is an American pharmaceutical corporation that develops and produces medicines and vaccines for a wide range of therapeutic areas, including immunology, oncology and cardiology. It is among the world’s largest pharmaceutical companies, with well known products like Lipitor, Lyrica and Viagra. The company was founded in 1849 and is headquartered in New York City, with its research headquarters in Groton, Connecticut. Pfizer employs approximately 90,000 workers worldwide.