On May 27 , 2010 , Birnbaum resigned her position . She resigned " on her own terms and on her own volition , " according to Ken Salazar , the United States Secretary of the Interior . The resignation came during the controversial Deepwater Horizon oil spill and Salazar 's subsequent announcement that the Minerals Management Service would be reorganized . She was replaced by Michael Bromwich , a litigation attorney and former federal prosecutor with a history of overseeing troubled federal agencies
Deepwater Horizon oil spill
Deepwater Horizon oil spill
S. Elizabeth Birnbaum