Robert Hardt b. 1945 Source: Wikimedia Commons About Robert Hardt American mathematician People from the Same Era Lembit Kaljuvee b. 1952 entrepreneur, politician Raja Norberto Rivera Carrera b. 1942 Catholic bishop, Catholic priest, university teacher Durango Hans Roelofsen b. 1950 musician Rotterdam John Ruthell Henry 1951–2014 Drago Druškovič b. 1950 artist Klagenfurt am Wörthersee Li Xueyong b. 1950 politician Shijiazhuang