Christian Reiher (born 19 April 1984 in Starnberg) is a German mathematician.

He is the fifth most successful participant in the history of the International Mathematical Olympiad, having won four gold medals in the years 2000 to 2003 and a bronze medal in 1999.

[1] Just after finishing his Abitur, he proved Kemnitz's conjecture, an important problem in the theory of zero-sums.

[2] He went on to earn his Diplom in mathematics from the Ludwig Maximilian University of Munich.

from the University of Rostock under supervision of Hans-Dietrich Gronau [de] in February 2010 (Thesis: A proof of the theorem according to which every prime number possesses property B)[3] and works now at the University of Hamburg.