Gerhard Schröder | Gerhard Richter | Gus Hansen | Gerhard Müller (rower) | Gerhard Müller | Gerhard von Scharnhorst | Al Hansen | Stan Hansen | Gunnar Hansen | Gerhard Munthe | Ron Hansen | Martin Lundgaard Hansen | Mark Victor Hansen | Kai Hansen | James Hansen | Gerhard Zucker | Gerhard | Rasmus Thrane Hansen | Peter Allan Hansen | Gerhard Markson | Gerhard Gentzen | Fritz Hansen | Carl Hansen Ostenfeld | Andrew Hansen | Tommy Hansen | Roberto Gerhard | Rick Hansen | Peter Hansen | Patti Hansen | National Hansen's Disease Museum |
Among other things, he collaborated with Gerhard Armauer Hansen who discovered Mycobacterium leprae the causative agent of leprosy, in the investigation of the effects of leprosy in the eyes.