http://www.imada.sdu.dk/~hjm/heegaard.html

Poul Heegaard (1871 - 1948),

a home page, created by Ellen S. and Hans J. Munkholm.

Poul Heegaard was a professor of mathematics at Copenhagen University 1910 - 1917 and at Christiania (later Oslo) University 1918 - 1941.  Today he is best known for his contributions to the study of three-manifolds; in fact Heegaard splittings and Heegaard diagrams are household words in that area, unfortunately often with the name misspelled as Heegard or even Hegard.

In addition, many topologists will know that Heegaard gave a counter example to Poincaré\'s first formulation of his duality theorem, and that Heegaard and Dehn\'s article Analysis Situs (1907, in the Enz. der Math. Wissenschaften) marks the foundation of combinatorial topology.