Quest Diagnostics is a publicly traded American clinical laboratory company founded in 1967 in New York City by Dr. Paul A. Brown. Headquartered in Secaucus, New Jersey, it is listed on the New York Stock Exchange under ticker DGX and is a member of the S&P 500. The company's integrated network offers a wide range of medical and diagnostic testing, including molecular diagnostics, pathology, and drug screening for patients, healthcare providers, employers, and insurers. It also provides services to life insurance and clinical trials markets. Quest operates through multiple business segments and collaborates with international partners.