Sergio Fajardo is a mathematician from University of the Andes, Colombia turned politician, was the mayor of Medellín from 2003 to 2007. He ran as an independent. Fajardo was granted a Ph.D. from the University of Wisconsin at Madison.
After he left the mayoralty, he briefly joined a national radio station as a commentator which raised his profile. The teacher-turned-politician recently figured highly in a poll of public figures, but he is neither aligned or opposed to Uribe.