COSMO ALEXANDER ( 1724 - 1772 ) was an American painter. COSMO ALEXANDER s works have been put up for auction numerous times, with realized prices varying from 3441.89 USD for PORTRAIT OF DR WILLIAM GORDON OF MONTROSE in 2003 to 4322.77 USD for PORTRAIT OF A YOUNG MAN AT HIS WRITING DESK in 2019 , based on the size and medium of the artwork.