United States President Barack Obama‎ Wednesday announced the appointment of Nigeria’s US-based expert Adewale “Wally” Adeyemo, 34, as the country’s new Deputy National Security Adviser for International Economic Affairs. He succeeds Caroline Atkinson.

Mr. Adeyemo joined the White House’s National Economic Council as deputy director this fall from the Treasury, where he served most recently as the deputy chief of staff to Secretary Jacob Lew.

He was the Treasury’s lead negotiator on the currency agreement that was part of the Pacific trade deal.

Mr. Adeyemo also worked on Treasury’s response to crises in Ukraine and Greece and in 2010 was one of the first officials charged with standing up the Consumer Financial Protection Bureau.

Obama thanked Ms. Atkinson for her service and said he was grateful that Mr. Adeyemo would carry on her work.

Mr. Adeyemo had been nominated by Mr. Obama to serve as assistant Treasury secretary for international markets and development, but a White House official said Mr. Adeyemo had asked the president to withdraw the nomination given his new role.

•Photo shows US new Deputy National Security Adviser, Adewale “Wally” Adeyemo.