One of the rare Norwegian mathematicians of renown, I was educated at the University of Christiana in Oslo.
On a visit to Paris, I collaborated with Felix Klein on a series of papers dealing with transformation groups, which eventually were named after me.
I was hooked, as the remainder of my career was focused on the mathematics of continuous transformation groups, especially as they related to symmetry and dynamics.
Basically, I showed how transformation groups can be used to classify partial differential equations and reduce classical methods to a single principle.
I also discovered a special "contact transformation" (now named after me) by which a sphere can be made to correspond to a straight line.
As a Norwegian mathematician, I was made a Honorary Member of the London Mathematical Society and a Fellow of the Royal Society.
Answer:
Marius Sophus Lie (1842  1899)
