He remained director until 1907, when at his request he was relieved of most administrative duties to focus on research, becoming director of Penn State's new Institute of Animal Nutrition. He led the Institute until his death in 1921. Between 1895 and 1902, he pulled double duty as dean of the College of Agricultural Sciences.[7] According to the American Journal of Nutrition, "he and Penn State grew up together."[2] Armsby was a prolific researcher, authoring more than 115 scientific publications.[3]