David Williams has worked at Johnson Space Center for almost 26 years. He worked as a contractor for 8 1/2 years and the last 17 years as a civil servant. He first worked in the Mission Operations Directorate as a certified flight controller in the life support area for the Space Shuttle for four years. He then worked in the Flight Crew Operations Directorate as a Group Lead for McDonnell Douglas managing the core system engineers in the Astronaut Support Office and was also responsible for the fluid systems for the Space Station Freedom for four and half years. In 1994 he accepted a civil servant position in the International Space Station Program Office (ISSPO) as the Deputy Environmental Control and Life Support (ECLS) System Manager for five years before taking a short rotation in Payload Engineering and Integration group for a year. Eleven years ago he transferred to the Engineering Directorate to become the International Space Station ECLS System Manager when the System Management job was transferred from the Program Office to Engineering Directorate. He stayed in that position for nine years before he decided to try a new challenge when he accepted a position as the Thermal/ECLS System Integration Group Co-Lead for the Constellation Program Office. As the Constellation Program was shutting down he started supporting the Commercial Crew & Cargo Program Office (C3PO) as the Active Thermal/ECLS C3PO Advisory Team Lead for the Cargo Vehicles and for Commercial Crew Development – 1 (CCDev – 1) project. He currently is supporting the Commercial Crew Program Office (CCPO) as a lead for Active Thermal/ECLS area for CCDev -2. In support of the ICES Conference David Williams is currently the 2011 ICES Vice Chair. In the past he was the Key Note Speaker one year, the American Society of Mechanical Engineering (ASME) Steering Committee member for ICES Conference for three years, has been the lead author for 28 papers, has chaired numerous sessions, and also has been the co-author of numerous papers.