Jeannette Janssen

Jeannette Catharina Maria Janssen is a Dutch and Canadian mathematician whose research concerns graph theory and the theory of complex networks. She is a professor of mathematics at Dalhousie University, the chair of the Dalhousie Department of Mathematics and Statistics,[1] and the chair of the Activity Group on Discrete Mathematics of the Society for Industrial and Applied Mathematics.[2]

Education and career

Janssen earned a master's degree at the Eindhoven University of Technology in 1988.[3] She completed her Ph.D. at Lehigh University in 1993. Her dissertation, Even and Odd Latin Squares, concerned Latin squares and was supervised by Edward F. Assmus Jr.[3][4]

From 1988 to 1990 Janssen was a lecturer at the Universidad de Guanajuato in Mexico. After completing her Ph.D., she became a postdoctoral researcher jointly at the Laboratoire de Combinatoire et d’Informatique Mathématique of Université du Québec à Montréal and at Concordia University. She took a position as a lecturer and research associate at the London School of Economics in 1995, and moved to Acadia University in 1997 before taking her present position at Dalhousie University.[3]

At Dalhousie, she was named department chair in 2016, becoming the first female chair of the mathematics department.[1]

Service

Janssen directed the Atlantic Association for Research in the Mathematical Sciences from 2011 to 2016, and chairs its board of directors.[5] She was elected as chair of the Activity Group on Discrete Mathematics (SIAG-DM) of the Society for Industrial and Applied Mathematics (SIAM) for the 2021–2022 term.[2]

Research

In a 1993 paper, Janssen solved the unbalanced case of the Dinitz conjecture, showing that any partial Latin rectangle could be extended to a full rectangle. The problem is equivalent to list edge-coloring of complete bipartite graphs, and her solution was based on earlier work on list coloring by Noga Alon and Michael Tarsi. Janssen's work "surprised even many of the experts",[6] and was considered to be "great progress" on the Dinitz conjecture. The remaining case of the conjecture for squares (balanced complete bipartite graphs) was proven a year later by Fred Galvin.[7]

References
  1. New Department Chair, Dalhousie Department of Mathematics and Statistics, 1 July 2016, retrieved 2021-01-13
  2. Activity Group on Discrete Mathematics, Society for Industrial and Applied Mathematics, retrieved 2021-01-13
  3. Curriculum vitae (PDF), retrieved 2021-01-13
  4. Jeannette Janssen at the Mathematics Genealogy Project
  5. Board of directors, Atlantic Association for Research in the Mathematical Sciences, retrieved 2021-01-13
  6. Cipra, Barry (1994), What's Happening in the Mathematical Sciences, vol. 2, American Mathematical Society, p. 43, ISBN 9780821889985
  7. Dinitz, Jeffrey H. (1995), Review of "The list chromatic index of a bipartite multigraph" by Fred Galvin, MR 1309363
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