Jackman attended Oregon Agricultural College in 1919-1920 and received his B.S. in Agronomy. He was appointed County Agent for Wasco County, Oregon, and except for a short period (1926-1929) he worked for Oregon State College's Extension Service until his retirement in 1959. In 1929 Jackman was appointed Extension Specialist in Farm Crops; in 1953 he was appointed Range Crops Management Specialist.
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