Recent and upcoming trips:
Dates
Occasion
Destination
Septermber 10-14, 2012Algebraic and complex GeometryHannover
July 9-13, 2012ANTS (tbc)San Diego
June 28-July 1, 2012Algebraic and Arithmetic GeometryKrakow
Late May, 2012Talk in OberseminarOldenburg
May 21-22, 2012Seminar lecturePoznan
May 3-4, 2012NogagsHamburg
April 24-26, 2012Seminar lectureBristol
March 22-26, 2012Research visit and seminar talkCosenza
March 20-22, 2012Research visit and seminar talkPisa
March 10-19 and 26-30, 2012Research visitTrieste
February 27-March 2, 2012Annual Meeting of the Schwerpunkt Algorithmic and experimental methods in Algebra, Geometry and Number TheoryHannover
February 7-10, 2012Research Visit and Seminar lectureNice
February 3, 2012 Workshop on algebraic surfacesHannover
February 1, 2012Talk at DoktorandendagPotsdam
January 24-28, 2012Research Visit and Seminar lectureKrakow
December 19-30, 2012Holiday 
December 16, 2011PhD defense Bas HeijneGroningen
November 11-12, 2011NogagsHannover
November 10, 2011NTH Computeralgebra Day (tbc)Hannover
October 4-7, 2011Research visit and
Workshop on Singularities and Monodromy		Hannover
August 29-September 2, 2011Research visitUniversity of Illinois at Chicago
August 25-29, 2011Conference A celebration of algebraic geometryCambridge, MA
August 16-25, 2011Workshop on Arithmetic and Geometry of K3 surfaces and Calabi-Yau threefoldsFields Institute, Toronto
July 25-August 10, 2011Holiday 
May 12-13, 2011NogagsBerlin
May 4-6, 2011Conference on the Birch and Swinnerton-Dyer conjectureCambridge
April 29, 2011Talk in the intercity number theory seminarGroningen
April 4-8, 2011Research Visit; Talk in the OberseminarHannover
February 21-25, 2011Holiday 
February 3-5, 2011From p-adic differential equations to arithmetic algebraic geometryPadova
November 18-19, 2010NogagsOldenburg
October 25-29, 2010Arithmetic of SurfacesLeiden
October 3-9, 2010Mini-Workshop: Higher Dimensional Elliptic FibrationsMFO, Oberwolfach
September 20-24, 2010Geometry and ArithmeticSchiermonnikoog
August 27 - September 10, 2010Visit M. KuwataTokyo
July 26 - August 3, 2010Holiday 
June 17-18NogagsHannover
May 17-21, 2010Workshop on Computational Number Theory and Arithmetic GeometryLeuven
April 23-34, 2010Number Theory DaysZürich
March 22-26, 2010Holiday 
March 15-19, 2010Effective methods in p-adic cohomology Oxford
March 11-12, 2010Workshop on elliptic surfacesBonn
Februari 16-20, 2010Conference on Algebraic Geometry and Arithmetic (tbc)Essen
December 3, 2009Talk in Oberseminar Algebraische und Arithmetische Geoemtrie.Hannover
November 19-20, 2009North German Algebraic Geometry SeminarFU Berlin
August 31 - September 3, 2009 Summer School on Local Systems Mainz
May 10-15, 2009Leopoldina-Symposium in Algebraic and Arithmetic Algebraic GeometryCentro Stefano Franscini, Ascona, Switzerland
April 21-25, 2009Counting points on VarietiesLorentz Center, Leiden
February 16-27, 2009Research visit + talkOxford University
Beginning of February 2009Research visit + talkCopenhagen, Denmark
November 29 - December 6, 2008Arithmetic of K3 SurfacesBanff, Alberta, Canada
November 7, 2008Private visit 
October 30-31, 2008 Diament meets GQTLeiden, The Netherlands
September 28-October 2, 2008Summer school on p-adic cohomologyMainz, Germany
September 24-26, 2008Private visitGroningen, The Netherlands
September 15, 2008Private visit 
August 25-29, 2008 Workshop on SingularitiesICMS, Edinburgh, UK
August 11-22, 2008Holiday 
July 28, 2008Private visit 
July 15-16, 2008Seminar lecture in Arbeitsgemeinschaft Arithmetik und SpiegelsymmetrieFreiburg, Germany
May 17-22, 2008 ANTS-VIII - Eighth Algorithmic Number Theory Symposium Banff Centre, Banff, Alberta, Canada
May 15-16, 2008North German Algebraic Geometry SeminarBerlin, Germany
May 9, 2008Intercity Number Theory SeminarLeiden, The Netherlands
April 4, 2008Intercity Number Theory SeminarGroningen, The Netherlands
February 22 - March 23, 2008Holiday, research visit and seminar lectures in Pisa (March 5) and Trieste (tba)Trieste, Italy
February 15, 2008 Berlin, Germany
February 13-14, 2008PhD defence Gert-Jan van der HeidenNijmegen, The Netherlands
December 24, 2007 -January 1, 2008Holiday 
tbc = to be confirmed