Carolyn Colvin, the former secretary of the state Department of Human Resources, became acting commissioner of the Woodlawn-based Social Security Administration on Thursday.
President Barack Obama has not yet nominated a successor for Michael J. Astrue, the appointee of former President George W. Bush whose six-year term ended last month. Obama's nominee must be confirmed by the Senate.
Colvin was deputy commissioner under Astrue and has also served as special assistant to Maryland's secretary of transportation.
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