Mathias Koeppel ( 1937 - ) is a Dutch painter. Mathias Koeppel s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 78 USD for Paar mit Hund beim Spaziergang in 2005 to 1992.49 USD for Gruppenfoto in Lübars in 2005 , based on the size and medium of the artwork.