He began his UC ANR career in 1966 as a UCCE farm advisor and worked with 4-H youth in Madera County. He subsequently became director for UCCE in Madera County, and then director for UCCE in Fresno County.
In 1985, Hambleton was appointed director for the 12-county UCCE South Central Region, where he served until his retirement in 1995.
Read more about his life at https://www.dignitymemorial.com/obituaries/fresno-ca/william-hambleton-10788411.