Josef Grassi ( 1755 - 1838 ) was an Austrian painter. Josef Grassi s works have been auctioned off multiple times, with realized prices varying according to the size and medium of the artwork, for instance of 13877.11 USD for A PORTRAIT OF A LADY, SAID TO BE COUNTESS AUGUSTA NIMPTSCH, SEATED FULL LENGTH, DRESSED IN A YELLOW AND BLUE DRESS WITH A RED CL in 2004