Daniel Kálmán Biss (born August 27, 1977) is an American mathematician and politician. Biss is the Mayor of Evanston, Illinois since 2021. He was a member of the Illinois Senate from the 9th district, serving from January 2013 to January 2019. The district includes Chicago's northern suburbs, including Evanston, Glencoe, Glenview, Golf, Morton Grove, Golf, Northbrook, Northfield, Skokie, Wilmette, and Winnetka. 