Jack Sieber is a Senior Scientist and Technology Officer with SEI-US. He develops computer-based tools to assist in long-range scenario planning, and working with researchers, policy makers and other stakeholders to help build a path to a sustainable future. He was the developer of WEAP , the Water Evaluation And Planning system, a leading integrated water resources planning tool used by hundreds of organizations worldwide. Jack received an MS in Computer Science from Yale University in 1988.