W.R. Berkley Corp. operates as an insurance holding company, which focuses on the property and casualty insurance business. It operates through the following business segments: Insurance-Domestic, Insurance-International and Reinsurance-Global. The Insurance-Domestic segment engages in commercial insurance business, including excess and surplus lines and admitted lines, primarily throughout the United States. The Insurance-International segment engages in insurance business primarily in the United Kingdom, Continental Europe, South America, Canada, Scandinavia, Asia, and Australia. The Reinsurance-Global segment engages in reinsurance business on a facultative and treaty basis, primarily in the United States, United Kingdom, Continental Europe, Australia, the Asia-Pacific Region, and South Africa. The company was founded by William R. Berkley in 1967 and is headquartered in Greenwich, CT.