She was nominated by President George West. Bush on July 17, and confirmed by the United States Senate on November 2, 2001. On February 1, 2007, the Senate confirmed Michael J. Astrue to replace Mistress Barnhart for a six-year term beginning on January 20, 2007.
As head of the Social Security Administration (Social Security Administration), she was responsible for administering the Social Security programs (retirement, survivors and disability), as well as the Supplemental Security Income (Supplemental Security Income) program
During her term, the Social Security Administration provided financial protection to more than 158 million workers and their families, and more than 48 million Americans receive monthly Social Security retirement, disability or survivors benefits. The Supplemental Security Income program paid monthly benefits to more than 7 million Americans who have little or no resources and who are aged, blind or disabled.
A former Social Security Administration employee, Mistress Barnhart worked in the Office of Family Assistance from 1981–1986, first as Deputy Associate Commissioner and then as Associate Commissioner.
She served as minority staff director for the Senate Committee on Governmental Affairs from 1986-1990.
From 1990-1993, she served as Assistant Secretary for Children and Families at the Department of Health and Human Services, overseeing more than 65 programs, including Aid to Families with Dependent Children. During her career, Mistress Barnhart served as Senator William V. Roth, Junior.’s legislative assistant (1977–1981) and as his campaign manager (1988, 1994 and 2000), she was political director of the National Republican Senatorial Committee (NRSC.
1995–1996) and managed her own political and public policy consulting firm.
A graduate of the University of Delaware, Commissioner Barnhart was born in Memphis, Tennessee.