Dee ihe ga-aga n'ihu na paragraf a - Hansen bụ onye otu ndị otu International Jury of Horticulture na World's Fair na St. Louis, Missouri
na 1904 na onye nnọchi anya United States na First International Congress of Genetics na London, England na 1906. O jere ozi dị ka odeakwụkwọ nke South Dakota Horticultural Society ruo ọtụtụ afọ. Na 1949, e wuru ihe ncheta iji kwanyere Dr. Hansen na onyinye ya ùgwù n'ogige ụlọ akwụkwọ South Dakota State College.