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  • NASA/Bill Ingalls via Getty Images

    NASA's acting chief retires with no obvious successor

    by 
    Mariella Moon
    Mariella Moon
    03.13.2018

    Robert M. Lightfoot Jr. has been heading NASA's efforts ever since the previous administrator, Charles F. Bolden Jr., stepped down with President Obama. Since he never officially became Bolden's replacement -- he was acting administrator for 14 months -- his previous job as NASA's third highest-ranking official was never filled. The second highest position in the agency also remains empty, so now that Lightfoot has decided to retire on April 30th, NASA has no clear successor to take over his duties.