Pfizer is the world’s largest pharmaceutical company. It was founded in New York in 1849 by Charles Pfizer and his cousin. Their business started booming after they discovered a process for making citric acid. This method was vital in producing penicillin during World War II and the US Army relied heavily on Pfizer for their antibiotics. Its most famous product, perhaps, is the drug Viagra. The company has had its share of success and controversy. In 2009, the U.S. Justice Department called it a “repeat offender” after it lost four high-profile healthcare fraud cases. Pfizer is also among the top ten U.S. companies with the biggest number of pollution sources. The company spends millions on preventing counterfeits of its drugs. It has a recent history of mergers with other international drugs companies.