 On February 1, 2007, the Senate confirmed Michael J. Astrue to replace Mrs. Barnhart for a six-year term beginning on January 20, 2007.As head of the Social Security Administration (SSA), she was responsible for administering the Social Security programs (retirement, survivors and disability), as well as the Supplemental Security Income (SSI) 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.