Robert Walker ( 1607 - 1658 ) was a British painter. Robert Walker s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 4831.18 USD for PORTRAIT OF SIR ALAN BRODRICK (1623-1680) in 2006 to 11284.09 USD for SELF PORTRAIT in 2006 , based on the size and medium of the artwork.