Covance Inc. (NYSE: CVD), formerly Hazleton Laboratories America, Inc., with heaquarters in Princeton, New Jersey, is a contract research organization, (also known as a clinical research organization or "CRO"), providing drug development and animal testing services. According to its website, it is one of the largest companies of its kind in the world, with annual revenues of over $1.4 billion, operations in 20 countries, and over 8,700 employees worldwide. It provides the world's largest central laboratory network, and employs a global team of clinical trial professionals and cardiac safety experts. It became a publicly traded company after being spun off by Corning, Inc. in 1997.