Mallory served as acting general counsel for the Council on Environmental Quality in the Obama administration from January 4, 2013 to August 6, 2013 between Scott Fulton and Avi Garbow.

[4] Mallory graduated from Yale College and then Columbia Law School, and started in private practice as an attorney before joining the U.S. federal government in 2000.

[5] Before Mallory joined the EPA, she was the chair of the natural resources practice group at the environmental law firm Beveridge and Diamond.

'"[9] On December 16, 2020, Mallory was reported to be the nominee selected by President-elect Joe Biden to run the White House Council on Environmental Quality (CEQ) in his administration.

"[9] On April 14, 2021, Mallory was confirmed as the leader of the White House Council on Environmental Quality (CEQ) by a 53–45 vote in the United States Senate.