Dan Walker, a former AMS Member, is Director and Senior Climate Scientist within Computer Sciences Corporation's CSC's Office of Science and Engineering for the North American Public Sector (NPS). He is based in Rockville, Maryland. Dr. Walker brings considerable academic and climate change policy expertise to the NPS Climate and Energy Practice. He understands the development and use of large-scale climate data sets and model output and the importance of predictive analytics and risk management in efforts to understand, mitigate, and adapt to climate change. Prior to joining CSC, Dr. Walker was Chief of the Climate Assessment and Services Division of the National Oceanic and Atmospheric Administration's Climate Program Office, where he managed NOAA's Climate and Societal Interactions Program. With a PhD degree in geology from the University of Tennessee, Dr. Walker has been involved with strategic planning and management of state and federal science for nearly 20 years. After occupying early positions with the states of Kentucky and North Carolina, he began his career in national and international science policy in 1996 as a program analyst with the National Research Council. During an eleven-year career with the NRC, Dr. Walker directed nearly 20 studies over a range of topics from coastal and ocean science, water resource management, oil spill impacts and response, to the national security implications of environmental and climate information, eventually being named a National Academies' Scholar in 2006. Dr. Walker then joined the Staff of the President's Science Advisor, where he had a hand in leading policy development at the White House Office of Science and Technology Policy from 2006 to 2009. He started as Senior Policy Analyst for Oceans and Climate and was eventually named Assistant Director for Environment. Dr. Walker has served as a Principal and Co-Chair on various U.S. federal interagency committees and bodies of the National Science and Technology Council, and he served as a U.S. Delegate to the International Panel on Climate Change (IPCC) from 2007 to 2010. Dr. Walker is a frequent speaker and presenter at climate and ocean policy meetings and panels. In addition to his contributions to various National Academies reports, he has published over 20 articles and editorials for various scientific journals and trade publications.