The former Western High School student is currently the inspector general of the Office of the Director of National Intelligence, for which she oversees inspections and audits. From 1993 to 2009 she served in senior positions at the Department of Justice.
"During her tenure here, Roslyn has been instrumental in ensuring the highest standards of accountability," Stephanie O'Sullivan, the principal deputy director of national intelligence, said in a statement.
Mazer graduated from Syracuse University and received a law degree from Catholic University of America. Her appointment is subject to Senate confirmation.