After graduating from the
University of Illinois at Urbana-Champaign in 1973, she moved to
Peoria to work for
WMBD (AM) She was agribusiness reporter for
WMBD-TV and
WCIA from 1974 to 1997. She started her own business, Colleen Callahan Communications, in 2003. At the beginning of 2003, she changed employers from WMBD in Peoria to
WGFA in
Watseka, Illinois; she has been agribusiness director at both stations. On 13 June 2009, Callahan began work as
United States Department of Agriculture Illinois State Director of
Rural Development. Once Pritzker had become governor, Callahan became Director of the
Illinois Department of Natural Resources on March 1, 2019. Callahan stepped down as department director on January 16, 2023, and was succeeded by former state legislator and IDNR's deputy director
Natalie Phelps Finnie. ==Civic participation==