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Artikeltje in 'Periodiek', Fysisch-Mathematische Faculteitsvereniging RUG, Nov./Dec. 2005 pp. 14 -17: An account of a climbing tour in the Bernese Alps




Mathematics in India: An account of a trip to India and Sikkim





August 2013: Col du Galibier, France







July 2013: Col du Grand St. Bernard, Swiss/Italy







November 2011, Kurama, Japan.







April 2009. Iguazu '09: horse riding near Buenos Aires, Argentina.







April 2009. Iguazu '09: with Robert, Femke and Jasper at the Iguazu waterfalls in Brazil.







November, 2008. Visit to the A-bomb dome in Hiroshima.







September, 2008. With Eva Zerz and Jochen Trumpf in the Negev near SdeBoker, Israel







July 2008. Hiking near Blacksburg, Virginia, USA, during the MTNS Conference at Virginia Tech.







November, 2007. Making a cycling tour through Tokyo






November, 2007. A dinner party in Nagoya







August 14, 2001. On the summit ridge of Grunegghorn (right), approaching the Gross Grunhorn (left)







August 14, 2001. On the summit of the Gross Grunhorn







August 15, 2001. On the summit of the Finsteraarhorn







August 16, 2001. On the summit of the Gross Fiescherhorn. In the picture on the left the Finsteraarhorn,
on the right the Gross Grunhorn








August 1998. On the summit of Piz Roseg





August 1998. On the summit of Piz Palu





Participants of the workshop for Jan Willems' 60th Birthday





Jan Willems together with his former and present Ph.D. Students