Diego Maria Rivera ( 1886 - 1957 ) was a Mexican Social Realism and Muralism painter. Diego Maria Rivera s works have been put up for auction numerous times, with realized prices greatly surpassing estimated prices, varying from 51000 USD for Dos hombres in 2003 to a remarkable record 1900000 USD for Huichol in 2005 , based on the size and medium of the artwork.