Gerhard Armauer Hansen
Gerhard Henrik Armauer Hansen was a Norwegian physician, remembered for his identification of the bacterium Mycobacterium leprae in 1873 as the causative agent of leprosy.
Hansen was born in Bergen and studied medicine at the Royal Frederiks University , gaining his degree in 1866. He served a brief internship at the National Hospital in Christiania and as a doctor in Lofoten. In 1868 Hansen returned to Bergen to study leprosy while working with Daniel Cornelius Danielssen, a noted expert.
Source: Wikipedia