Aspen Insurance Holdings Ltd. engages in the provision of insurance and reinsurance services. It operates through the Insurance and Reinsurance segments. The Insurance segment offers property and casualty insurance, marine, aviation and energy insurance, and financial and professional lines insurance. The Reinsurance segment consists of property catastrophe reinsurance, other property reinsurance, casualty reinsurance, and specialty reinsurance. The company was founded by Christopher O'Kane and Julian Michael Cusack on May 23, 2002 and is headquartered in Hamilton, Bermuda.