Part‑time jobs as a Christmas card salesman, gardener, paperboy, bus boy, soda jerk, pool hall attendant, life guard, swim instructor, library page, writer, dude ranch roustabout, Colorado Historical Society tour guide, collections & photo librarian.
2018-present: Appointed Official State Historian of Colorado
2009-present: Co-Director of the Center for Colorado & The West
1990-present: Professor of History & Chair 1992-96; Director of Public History & Colorado Studies, Univ. of Colorado at Denver
1981‑present: Tour Leader for Smithsonian Institution's week-long "Railroading the Rockies" and for Colorado Historical Society Cemetery, Church, Ghost Town, Neighborhood & Saloon tours.
1972‑81: Part‑time history instructor at Colorado Womens College, Arapahoe Junior College, Metropolitan State College, University of Denver, Regis College, University of Colorado at Denver.
1970‑72: Language Arts Teacher, Hillel Academy, Denver.
1969‑70: Resource Librarian, Univ. of California, Riverside.