Bob Gruen ( 1946 - ) is an American painter. Bob Gruen s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 600 USD for Debbie Harry, Maxe;s, 1976 in 2009 to 4500 USD for John Lennon, NYC, 1974 in 2009 , based on the size and medium of the artwork.