General Re, or Gen Re to its friends, is a subsidiary of Berkshire Hathaway and one of the top four reinsurers in the world. The company's main subsidiary, General Reinsurance, is one of the biggest property & casualty reinsurers in the US. Its second-largest operating company is Germany's Kölnische Rückversicherungs-Gesellschaft (Cologne Re), the world's oldest reinsurer and a major force in international reinsurance. In addition to insurance Gen Re's nearly a dozen subsidiaries offer investment and risk management services to reinsurers and accident and disability case management. Its London market Faraday subsidiary offers reinsurance in the UK while USAU offers aviation and aerospace insurance in the US.