was a romanticist Baltic German painter.
He was born in Kuressaare, Estonia, on 29 January 1841 in the Julian calendar (10 February 1841 according to the Gregorian calendar) and died on 6 December 1916 in Dusseldorf, where he developed almost all his career. A notable student of his was the Norwegian landscape painter Adelsteen Normann who studied with Ducker from 1869 to 1872.
