NPR's CEO Gary Knell is leaving the position after just 18 months, it was announced Monday.
He is leaving this fall to become president and CEO of the National Geographic Society, according to a statement from the network.
Knell made the announcement in a letter to employees. He thanked them, and said that the National Geographic Society approached him with an opportunity he "could not turn down."
He started his role at NPR in October 2011. At the time, he said that his goal was to "depoliticize" the debate over public radio. He took over during a tumultuous year that saw the loss of the network's CEO and its top news executive to scandal.