King has been the center director at Marshall since June 2003. His departure ends a 25-year career with NASA that began in 1983 at NASA's Kennedy Space Center in Florida, where he served as director of space shuttle processing and shuttle launch director.

"David's expertise and dedication will be sorely missed, not only at Marshall, but across the entire agency," NASA Acting Administrator Chris Scolese said. "As sad as we are to see him leave, we wish him the very best in all of his future endeavors."

King described his decision to leave NASA as one of the toughest of his professional career. "The opportunities NASA has given me are something most people only dream about," King said. "It was a privilege to work with some of the smartest people in the world for 25 years. I will miss them greatly."

King's acting successor, Lightfoot, has served as Marshall's deputy director since May 2007. A native of Montevallo, Ala., he has shared responsibility for managing Marshall, one of NASA's largest field centers. The center has more than 8,400 civil service and contract employees performing a wide scope of propulsion, scientific and space transportation activities.

"Robert's experience and leadership skills are exactly what we need to lead Marshall at this critical time," Scolese said. "I'm certain he will do a terrific job in this role as he has in all of his previous positions at NASA."

From 2005 to 2007, Lightfoot served as manager of the Space Shuttle Propulsion Office at Marshall, leading the organization with responsibility for the manufacture, assembly and operation of the primary shuttle propulsion elements: the main engines, external fuel tank, solid rocket boosters and reusable solid rocket motors.

For the two years prior to that, Lightfoot was assistant associate administrator for the Space Shuttle Program in the Office of Space Operations at NASA Headquarters in Washington. His responsibilities included space shuttle return to flight activities, budget formulation and integration of shuttle infrastructure into the Constellation Program, the new initiative of human exploration of the moon, Mars and beyond.

In 2002, Lightfoot was director of the Propulsion Test Directorate at NASA's Stennis Space Center in Bay St. Louis, Miss. He began his NASA career at Marshall in 1989 as a test engineer and program manager for the space shuttle main engine technology test bed program, and the Russian RD-180 engine testing program for the Atlas launch vehicle program.

Lightfoot has received numerous awards during his NASA career, including a NASA Outstanding Leadership medal in 2007 for outstanding and exemplary leadership of the Shuttle Propulsion Office and assuring safety for the shuttle's return to flight. In 2006, he was awarded the Presidential Rank Award for Meritorious Executives - the highest honor attainable for federal government work.

"Robert is a tremendous leader and one of NASA's best," King said. "I leave with full confidence that Marshall will be in great hands."

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