Assistant professor, University of Aarhus, 1966-69; research fellow, University of Warwick, 1969-72; associate professor, University of Copenhagen, Denmark, 1972-80. Professor of mathematics at the Technical University of Denmark since 1980. Visiting professor at the University of Maryland, College Park, US, Fall 1986.

Fascinated by the interaction between the abstract and the concrete in mathematics, and by finding serious mathematics in the description and explanation of phenomena from the real world. Research papers in topology, geometry, and global analysis. Other research interests include mathematical education and the history of mathematics.

Enjoys philosophical discussions, music, soccer and family life.

Knight of the Order of Dannebrog, 1993; 1st class, 2010.

Recipient of the G.A. Hagemann Gold Medal,
Technical University of Denmark, 2011.

Fellow of the European Academy of Sciences, 2004.
Fellow of the American Mathematical Society (inaugural class), 2012.