Jean Léon Jansem (after) ( 1920 - 1990 ) was a French painter. Jean Léon Jansem (after) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 50.22 USD for Projet d'affiche in 2005 to 2300 USD for JEAN JANSEM in 2006 , based on the size and medium of the artwork.