It deeply saddens us to bring you the news that Lloyd Clarke was killed in a bicycling accident on September 20, 2007 in Incline Village, NV. He is survived by his wife, Sherol, and his daughter, Elta. Lloyd was an active member of the INFORMS community, and his absence will be deeply felt by many. Lloyd received his PhD from the Systems Engineering department at the University of Pennsylvania in 1992. After completing his degree, he took a post-doctoral position, and later a faculty appointment, in the Computational Optimization Center in the School of Industrial and Systems Engineering at the Georgia Institute of Technology. He worked in the area of airline optimization, specializing in aircraft, crew, and maintenance scheduling. In 1999, he brought this experience to Schneider National, where he worked on an in-house yield management system for Schneider's trucking business. Lloyd moved to ILOG, Inc. in 2000, where as CPLEX Product Manager he played a major role in setting the direction for the CPLEX product. He represented the CPLEX customer, interacting with the CPLEX user base to understand their needs, and using this understanding to guide the evolution of the product. In 2006, Lloyd moved to the role of CPLEX Development Manager, where he led the development team through the release of CPLEX 11.0. He brought a new and innovative perspective to this leadership role, and excelled at both unifying and motivating the team. Lloyd was an active member of the INFORMS community, serving on the advisory council for several INFORMS Practice meetings, and as the industry liaison and practitioner program chair for several INFORMS general meetings. He was known among his friends and colleagues for his kindness, his devotion to both work and family, his sense of humor, his seemingly boundless enthusiasm for whatever task he undertook, and his infectious sense of optimism. In addition to enjoying photography, Lloyd was an avid bicyclist, typically biking more than 150 miles per week. The one small comfort we can take is that he died doing something he loved. ILOG established a fund in Lloyd's memory and collected personal contributions to a Lloyd Clarke Memorial Fund. The contributions were directed to an educational fund for his daughter. The fund was closed in February, 2008. ILOG thanks all who contributed to Lloyd's memory.