Daniel Kálmán Biss[1] (born August 27, 1977)[2] is an American mathematician and politician serving as mayor of Evanston, Illinois.

[7][8] He received an undergraduate degree from Harvard University, graduating summa cum laude in 1998, and an MA and Ph.D. at MIT in 2002, all in mathematics.

[13] In 2008 and 2009, Biss acknowledged the flaw and published erratum reports for the two papers, thanking Mnëv for drawing his attention to the error.

[9][14][15] He and a co-author, Benson Farb, also acknowledged in 2009 that there was a "fatal error" in a paper they had published in Inventiones Mathematicae in 2006, thanking mathematicians Masatoshi Sato and Tom Church for helping to explain the problem.

"[18][20] When the 2017 retraction and the previously identified errors were reported by the Chicago Sun-Times in September 2017, his campaign blamed operatives for the perceived front-runner for the Democratic Party candidate for governor of Illinois, J.

[18] Biss ran for a seat in the Illinois State House of Representatives in 2008, losing to Republican Elizabeth Coulson in the 17th district.

He also supports allowing Illinois high school graduates to pay in-state tuition at public universities regardless of immigration status, as well as state funding to raise the salaries of teachers.

[39] He also co-sponsored SB 1933, a bill by State Sen. Andy Manar to allow for automatic voter registration when applying for an Illinois driver's license.

[41][42] In June 2017, Biss voted to reinforce the Affordable Care Act in Illinois by prohibiting insurance companies from discriminating against customers with pre-existing conditions.

[43] In 2015, Biss announced a run for Illinois Comptroller for the 2016 special election[44] but dropped out and endorsed opponent Susana Mendoza.

[46] Biss joined a growing field of Democratic contenders, including businessman C. G. Kennedy and Chicago alderman Ameya Pawar.

[47] Biss briefly named Chicago alderman and Democratic Socialists of America member Carlos Ramirez-Rosa as his gubernatorial running mate, but dropped him from the ticket after just six days because Ramirez-Rosa had expressed some support for the BDS movement which seeks to impose comprehensive boycotts on Israel over alleged human rights violations against Palestinians.

[48] Biss later announced his selection of Rockford-based state representative Litesa Wallace, a single mother and former social worker.

[49][50] Biss was endorsed by many of his colleagues in the Illinois General Assembly, high-profile academics and activists including Nobel laureate Richard Thaler and presidential candidate Lawrence Lessig, National Nurses United, the largest organization of registered nurses in the United States, and Our Revolution, the successor organization to Bernie Sanders' 2016 presidential campaign.

[68] The Democratic Party of Evanston gave Biss its endorsement,[69][70] as did Northside Democracy for America,[71] the Organization for Positive Action and Leadership (OPAL),[72] and the Community Alliance for Better Government (CABG).

[74] Biss won a landslide victory in the consolidated primary on February 23, 2021, forgoing the need for a runoff by receiving an outright majority of the vote.

[79] Biss also gave outgoing mayor Steve Hagerty input on the members he recommended to the city's Reparations Committee.