The German mathematician

Sigismund Steinitz studied at the University of Breslau and the University of Berlin, receiving Sigismund Steinitz's Ph.D... David Hilbert was a German mathematician.

a German mathematician and one of the most influential mathematicians of the 19th and early 20th centuries

David Hilbert (/ˈhɪlbərt/; German: [ˈdaːvɪt ˈhɪlbɐt]; 23 January 1862 – 14 February 1943) was a German mathematician, one of the most influential mathematicians of the 19th and early 20th centuries.

a 20th century mathematician

David Hilbert is a 20th century mathematician, and was chosen as the judge because David Hilbert is famous in part for Hilbert's Problems.

a German mathematician, logician, and philosopher of mathematics

David Hilbert (Königsberg,[1] Prussia, 23 January 1862 –Göttingen, Germany, 14 February 1943) was a German mathematician, logician, and philosopher of mathematics.