Scott Darling, chief counsel of the Federal Motor Carrier Safety Administration, will become acting administrator after the departure of Anne Ferro, who has held the position nearly five years.
Ferro released the news to colleagues in an e-mail Aug. 22, her last day as administrator before becoming president of the American Association of Motor Vehicle Administrators on Aug. 25.
Ferro also said that deputy administrator Bill Bronrott will leave his job by the end of the year.
Darling, who holds one of four political appointee slots at the agency, was named chief counsel by President Obama in September 2012.
He came to FMCSA from the Massachusetts Bay Transportation Authority, the public transit agency serving the greater Boston area, where he served as deputy chief of staff and assistant general counsel.