Mary Margaret O'Reilly (October 14, 1865 - December 6, 1949) was the acting director of the Mints and Assay Office of the United States Department of the Treasury and later assistant treasurer.[1] She was known as the "sweetheart of the Treasury".[2][3]
She was born on October 14, 1865 in Springfield, Massachusetts. She started work at the mint in 1904.[1]
A presidential executive order allowed her to work past her mandated retirement age.[4][5]
She retired at age 73 in 1938.[2][3] She died in Washington, D.C. on December 6, 1949.