Gus Hansen | Al Hansen | Stan Hansen | Gunnar Hansen | Ron Hansen | Martin Lundgaard Hansen | Mark Victor Hansen | Kai Hansen | James Hansen | Rasmus Thrane Hansen | Peter Allan Hansen | Katja Seizinger | Fritz Hansen | Carl Hansen Ostenfeld | Andrew Hansen | Tommy Hansen | Rick Hansen | Peter Hansen | Patti Hansen | National Hansen's Disease Museum | Katja Schuurman | Karl Aage Hansen | Julia Butler Hansen | Jógvan Hansen | Jennifer Hansen | James V. Hansen | Hansen | George V. Hansen | Frode Holstad Hansen | Cato Hansen |
Founded in Brazil in 1993, OIA was the collaborative brainchild of anti-poverty activist Waldemar Boff, renowned chemist Prof. Michael Braungart, community entrepreneur Valmir Fachini, biological engineer Katja Hansen, and environmental manager Douglas Mulhall.