Johann Rudolf Studer ( 1700 - 1769 ) was a Swiss painter. Johann Rudolf Studer s works have been put up for auction numerous times, with realized prices varying from 1880.68 USD for PORTRAIT OF GERTRUDE LEVESON-GOWER, DUCHESS OF BEDFORD (1714/15-1794) in 2006 to 4102.4 USD for Susanna beim Baden. in 2007 , based on the size and medium of the artwork.