Jamieson Greer served as chief of staff at USTR in Trump’s first term.

President-elect Donald Trump picked Jamieson Greer to be U.S. trade representative, elevating a figure little known outside of Washington to what is expected to be one of the most important posts in the incoming administration.

Greer, a former Air Force lawyer turned trade litigator, is a protegé of Robert Lighthizer, who was Trump’s trade representative in his first administration and is expected to influence trade policy in Trump’s second term.

“Jamieson will focus the Office of the U.S. Trade Representative on reining in the Country’s massive Trade Deficit, defending American Manufacturing, Agriculture and Services and opening up Export Markets everywhere,” Trump said in a statement posted on Truth Social.