Theodor Kaluza, German mathematician and physicist (d. 1954)
Theodor Franz Eduard Kaluza (German: [kaˈluːt͡sa]; 9 November 1885 – 19 January 1954) was a German mathematician and physicist known for the Kaluza–Klein theory, involving field equations in five-dimensional space-time. His idea that fundamental forces can be unified by introducing additional dimensions re-emerged much later in string theory.