Quest Diagnostics is headquartered in Madison, New Jersey, and has been in business for more than 50 years. They are an American clinical laboratory that works with hospitals and clinics in many different parts of the world. They are also named on the Fortune 500 list. As of 2017, Quest Diagnostics had more than 45,000 people working for them. Some of the employment opportunities that may be available include information technology, pathologists, bioinformation architects, associate medical directors, associate software engineers, laboratory support technicians, drivers and much more.