Ernst Hairer (born 19 June 1949)[1] is a professor of mathematics at the University of Geneva known for his work in numerical analysis.

[2] He is the father of the mathematician Martin Hairer, who won the Fields medal in 2014.

Hairer holds a doctor honoris causa from the University of Lund.

[5][6] In 2003 he was awarded, jointly with Gerhard Wanner, the Peter Henrici Prize by the Society for Industrial and Applied Mathematics.

[7] In 2009 a conference on scientific computing and differential equations was held in honor of his 60th birthday, at the University of Geneva,[1] and in the same year the 7th International Conference in Numerical Analysis and Applied Mathematics in Crete was dedicated in his honor.