Leonhard Posch ( 1750 - 1831 ) was a German painter. Leonhard Posch s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 900 USD for Bildnis Zollikofer im Profil nach rechts in 2015 to 4000 USD for Bildnis des Berliner Bankiers Brose in 2015 , based on the size and medium of the artwork.