John Cosmo Clark ( 1897 - 1967 ) was a British painter. John Cosmo Clark s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 95.13 USD for STUDY FOR HORSEGUARDS PARADE, WHITEHALL 1959 in 2005 to 34098.62 USD for Scullers and Eights at Henley in 2012 , based on the size and medium of the artwork.