Isaac Grünewald ( 1889 - 1946 ) was a Swedish Modernism and Expressionism painter. Isaac Grünewald s works have been put up for auction numerous times, with realized prices greatly surpassing estimated prices, varying from 1969.5 USD for SITTANDE MODELL in 2003 to a remarkable record 908677.87 USD for Anna in 2012 , based on the size and medium of the artwork.