William Matthew Prior (attributed To) ( 1806 - 1873 ) was an American painter. William Matthew Prior (attributed To) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 4700 USD for Portrait of a Man in 2004 to 10575 USD for Portraits of a Lady and a Gentleman in 2007 , based on the size and medium of the artwork.