Charles Bolden

NASA's acting administrator to retire without a clear successor

Robert M. Lightfoot, Jr., who has served as acting administrator at NASA for more than a year, said Monday that he will retire from his position in April. No immediate announcement was made on who will follow him.

In an agencywide memo, Lightfoot wrote that he had "bittersweet feelings" about the decision. He also said he will "work with the White House on a smooth transition to the new administrator."

NASA has been without a permanent administrator since Charles Bolden, a former astronaut and retired Marine Corps aviator, resigned from his role the day the President Donald Trump took office last year. The second-in-command, deputy administrator Dava...