 He provided commentary in twenty made-for TV documentaries, covering diverse topics, such as World War II, Lewis & Clark, and America's prominence in the 20th century.He also appeared as a guest on numerous TV programs or stations, including "The Charlie Rose Show", C-Span programming, CNN programming, NBC's "Today Show", CNBC's "Hardball", and various programming on The History Channel and the National Geographic Channel.Ambrose's association with National Geographic stemmed, in part, from his designation as an Explorer-in-Residence by the Society.