Hansen was a member of the International Jury of Horticulture at the World's Fair in St. Louis, Missouri in 1904 and a United States delegate to the First International Congress of Genetics in London, England in 1906.
Niels Bohr | Gus Hansen | Niels-Henning Ørsted Pedersen | Al Hansen | Stan Hansen | Niels Bohr Institute | Niels Juel | Niels Ferguson | Gunnar Hansen | Ron Hansen | Niels Henrik Abel | Martin Lundgaard Hansen | Mark Victor Hansen | Kai Hansen | James Hansen | Rasmus Thrane Hansen | Peter Allan Hansen | Niels Shoe Meulman | Niels Helveg Petersen | Fritz Hansen | Carl Hansen Ostenfeld | Andrew Hansen | Tommy Hansen | Rick Hansen | Peter Hansen | Patti Hansen | Niels Frederiksen | Niels Ebbesen | Niels Ditlev Riegels | National Hansen's Disease Museum |