Claim: Ada Hayden (who had died of cancer at age 65) had taught Botany at Iowa State in 1911 as an instructor, then became an assistant professor of botany in 1920.
Evidence: Ada Hayden died of cancer in 1950, at age 65. Hayden taught botany as an instructor at Iowa State beginning in 1911, and continued in this role until she earned her doctoral degree. She became an assistant professor of botany in 1920, and a research assistant professor at the Agricultural Experimental Station (Lakes Region) and curator of the herbarium in 1934.