Hugh Brannum was an American vocalist, arranger, composer, and actor known for his role as Mr. Green Jeans on the children's television show Captain Kangaroo. During his days with Fred Waring and his Pennsylvanians, Brannum used his childhood nickname "Lumpy".

Captain Kangaroo is an American children's television series that aired weekday mornings on the American television network CBS for 29 years, from 1955 to 1984, making it the longest-running nationally broadcast children's television program of its day. In 1986, the American Program Service integrated some newly produced segments into reruns of past episodes, distributing the newer version of the series to PBS and independent public stations until 1993.