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Robert J. Walker (July 19, 1801 – November 11, 1869) was an American lawyer, economist and politician. He served as a member of the United States Senate representing the state of Mississippi from 1835 until 1845, and as Secretary of the Treasury from 1845 to 1849 during the administration of President James K. Polk. This line engraving of Walker was produced by the Department of the Treasury's Bureau of Engraving and Printing (BEP) as part of a BEP presentation album of treasury secretaries. The portrait appeared on the fifth issue of 25-cent fractional-currency notes, issued in 1874.Engraving credit: Bureau of Engraving and Printing; restored by Andrew Shiva