The Center for International Environmental Law (CIEL) is a public nonprofit environmental law firm based in Geneva, Switzerland with an office in Washington, DC, United States. It was founded in 1989. CIEL's team aims to "strength and use international law to protect the environment, promote human health, and ensure a environmental friendly society." They help educate organizations, corporations, and the public on environmental issues and conduct their own research. Carroll Muffett has been the president and CEO of CIEL since September 2010. CIEL also offers internship, externship, and fellowship programs.