Markel Corporation markets and underwrites specialty insurance products in the United States and internationally. It operates in three segments: Excess and Surplus Lines, Specialty Admitted, and London Insurance Market. The Excess and Surplus Lines segment writes risks outside of the standard market, including catastrophe-exposed property, professional liability, products liability, general liability, commercial umbrella, and other tailored coverages. This segment also provides environmental, transportation, inland marine, ocean marine, and railroad insurance products, as well as casualty facultative reinsurance, and public entity insurance and reinsurance products. The Specialty Admitted segment writes risks that remain with an admitted insurance company for marketing and regulatory reasons. The London Insurance Market segment writes specialty property, casualty, professional liability, equine, marine, energy, trade credit insurance and reinsurance, crime and contingency, accident and health, products liability, excess and umbrella, and environmental liability coverage products. Markel Corporation was founded in 1930 and is headquartered in Glen Allen, Virginia.