Framed poster of Albert Einstein, 19 x 25 inches, with his famous quote 'Great Spirits have always encountered violent opposition from mediocre minds'. Albert Einstein (1879 - 1955) was a German-born theoretical physicist -- the most influential physicist of the 20th century, who developed the theory of relativity, one of the two pillars of modern physics. Donor's name and occasion information were not provided to the City Clerk's office.