Tuhia he tohutoro mō tēnei rārangi - He mema a Hansen o te Rōpū Whakawhanaunga o te Ao i te Whakaaturanga o te Ao i St. Louis, Missouri
i te tau 1904 me te mema o te United States ki te First International Congress of Genetics i London, Ingarangi i te tau 1906. I mahi ia hei hēkeretari mo te South Dakota Horticultural Society mo nga tau maha. I te tau 1949, i whakaarahia he tohu whakamaumahara ki a Dr. Hansen me ana takoha i te whare wananga o South Dakota State College.