Dr. Mark Trexler worked on the first carbon offset project while on the staff of the World Resources Institute in Washington, DC, and worked extensively with the Intergovernmental Panel on Climate Change (IPCC) on carbon offset and natural climate solution topics. He has participated in the development of and due diligence on hundreds of carbon offset projects, and his team at EcoSecurities (one of the early major carbon market players in) developed the first carbon offset scoring system. Mark has advised clients around the world on climate change risk and risk management, co-authored the first textbook on business climate risk, teaches climate change mitigation at George Washington University, and co-developed the Climate Web decision-support system. He holds advanced degrees from the University of California at Berkeley.