1. 18.06.2019, Universität Leipzig:
   Arithmetik und Geometrie algebraischer Flächen
2. 12.06.2019, Institute of Mathematics, Polish Academy of Sciences, Krakow:
   Smooth rational curves on K3 surfaces
3. 21.05.2019, Åbo University, Turku:
   Smooth rational curves on K3 surfaces
   [N-cube days X]
4. 20.01.2019, University of Tokyo:
   Equicharacteristic models of nodal Enrques surfaces
   [Workshop Arithmetic and Algebraic Geometry 2019]
5. 12.09.2018, Cetraro:
   Lines on surfaces in IP^3 - from quartics to quintics
   [Conference Differential, Algebraic and Topological Methods in Complex Algebraic Geometry]
6. 11.07.2018, FBK, Trento:
   Zariski K3 surfaces
   [Workshop Recent Progress in the Arithmetic and Geometry of K3 Surfaces]
7. 15.06.2018, UFRJ, Rio:
   Singular K3 surfaces of class number 2
   [Geometry seminar]
8. 03.05.2018, Shepperton:
   Singular K3 surfaces of class number 2
   [Mini-Conference K3 surfaces and Galois representations]
9. 26.04.2018, Pedagogical University, Krakow:
   Zariski K3 surfaces
   [Workshop and Conference Modern and Classical Aspects on Algebraic Surfaces]
10. 30.01.2018, Hosei University, Tokyo:
    Zariski K3 surfaces
    [Workshop Algebraic Geometry in Positive Characteristic and Related Topics]
11. 07.12.2017, Universität Bayreuth:
    Elliptische Flächen
12. 07.11.2017, University of Warwick:
    Zariski K3 surfaces
    [Warwick Algebraic Geometry Seminar]
13. 12.07.2017, Humboldt-Universität Berlin:
    Enriques surfaces with maximal root types: moduli and good reduction
    [Conference Higgs Bundles, K3 Surfaces and Moduli]
14. 22.06.2017, Uniwersytetu Jagiellońskiego, Krakow:
    Nodal curves and Enriques surfaces
15. 02.06.2017, Universität Göttingen:
    Elliptic surfaces in geometry and arithmetic
    [Göttingen-Hannover Number Theory Workshop]
16. 30.03.2017, Haeundae, Korea:
    Configurations of nodal curves on Enriques surfaces
    [Algebraic Geometry Conference (Keum60)]
17. 13.12.2016, University of Tokyo:
    Singular K3 surfaces of class number 2
    [Conference Arithmetic and Algebraic Geometry]
18. 04.11.2016, Albert-Ludwigs-Universität Freiburg:
    Elliptic surfaces
19. 14.06.2016, Bedlewo:
    Gorenstein Q_l-cohomology projective planes
    [Conference: Varieties with trivial canonical bundles]
20. 17.02.2016, Universität Saarbrücken:
    Geraden auf glatten Quartiken in IP^3
21. 11.02.2016, FU Berlin:
    Lines on smooth quartics in IP^3
    [Arithmetic Geometry Seminar]
22. 04.02.2016, Universität Bielefeld:
    Eine glatte Quartik in IP^3 mit 60 Geraden und S_5-Symmetrie
    
23. 27.01.2016, Tokyo University:
    Gorenstein Q_l-cohomology fake projective planes
    [Conference Algebraic and Arithmetic Geometry 2016]
24. 17.12.2015, Gutenberg-Universität Mainz:
    Moduli of Gorenstein Q-homology fake projective planes
    [SFB-Kolloquium]
25. 02.12.2015, University of Cambridge:
    Moduli of Gorenstein Q-homology fake projective planes
    [Algebraic Geometry Seminar]
26. 19.11.2015, KIAS, Seoul:
    Moduli of Gorenstein Q-homology fake projective planes
    [Conference on K3 surfaces and related topics]
27. 19.10.2015, ICERM, Providence:
    Modularity of K3 surfaces and Calabi-Yau threefolds
    [Workshop Explicit methods for modularity of K3 surfaces and other higher weight motives]
28. 29.01.2015, University of Tokyo:
    Profile of some beautiful K3 surfaces
    [Conference Algebraic and Arithmetic Geometry 2015]
29. 12.11.2014, Universität Bielefeld:
    Picard numbers — K3 surfaces and beyond
30. 2.07.2014, Universität Leipzig:
    K3 surfaces
    [Felix Klein Kolloquium]
31. 7.05.2014, Schiermonnikoog:
    The maximum number of lines on smooth quartic surfaces
    [Conference on K3 surfaces and their moduli]
32. 25.03.2014, Leibniz Universität Hannover:
    From modularity to Maschke's octic and back
    [Workshop Experimental Methods in Computational Algebra]
33. 20.03.2014, LMU München:
    The maximum number of lines on smooth quartic surfaces
    [Workshop Geometry and Arithmetic of Surfaces]
34. 17.02.2014, Universität Osnabrück:
    64 lines on smooth quartic surfaces
    [Kolloquium]
35. 27.01.2014, Tokyo University:
    64 lines on smooth quartic surfaces
    [Arithmetic and Algebraic Geometry 2014]
    
36. 13.11.2013, Fields Institute Toronto:
    64 lines on smooth quartic surfaces
    [Thematic Program on Calabi-Yau Varieties]
37. 12.11.2013, Fields Institute Toronto:
    Picard numbers of quintic surfaces
    [Thematic Program on Calabi-Yau Varieties]
38. 29.01.2013, Tokyo University:
    Picard numbers of quintic surfaces
    [Arithmetic and Algebraic Geometry 2013]
    
39. 14.11.2012, Universität Rostock:
    Arithmetik von K3 Flächen
    [Mathematisches Kolloquium]
40. 9.11.2012, Universita degli studi di Milano:
    Picard numbers of quintic surfaces
41. 12.09.2012, Leibniz Universität Hannover:
    Picard-Zahlen von Quintiken
42. 30.06.2012, Krakow:
    Picard numbers of quintic surfaces
    [ECM satellite conference "Algebraic and Arithmetic Geometry"]
43. 30.05.2012, KU Leuven:
    Arithmetic of K3 surfaces
44. 16.04.2012, Universität Zürich:
    Arithmetic of quintic surfaces
    [Oberseminar Algebraische Geometrie]
45. 16.01.2012, Institut für experimentelle Mathematik, Essen:
    Die Modularität von Maschkes Oktik und Calabi-Yau-Varietät
46. 16.12.2011, Rijksuniversiteit Groningen:
    Arithmetic of quintic surfaces
    [Intercity Number Theory Seminar]
47. 08.12.2011, Freie Universität Berlin:
    Arithmetik algebraischer Flächen
48. 06.12.2011, Humboldt Universität Berlin:
    Modularity of Maschke's octic and Calabi-Yau threefold
    [Forschungsseminar "Arithmetische Geometrie"]
49. 01.12.2011, Universität Augsburg:
    Arithmetik von K3-Flächen
    [Oberseminar]
50. 21.11.2011, Goethe-Universität Frankfurt
    Arithmetik von Quintiken
    [Kolloquium zur algebraischen Geometrie]
51. 10.10.2011, CIRM, Luminy:
    Shimura varieties for abelian fourfolds with an automorphism of order five
    [Conference on Moduli spaces and automorphic forms ]
52. 06.09.2011, Carl von Ossietzky Universität, Oldenburg:
    Sandwich-Theoreme für Shioda-Inose Strukturen
    [Oberseminar]
53. 16./17.08.2011, Fields Institute Toronto:
    Arithmetic of K3 surfaces
    [Workshop on Arithmetic and Geometry of K3 surfaces and Calabi-Yau threefolds]
54. 15.07.2011, Institut für experimentelle Mathematik, Essen:
    Arithmetik von Quintiken
55. 08.07.2011, Universität Ulm:
    Arithmetik algebraischer Flächen
56. 01.07.2011, Ruprecht-Karls-Universität Heidelberg:
    Shimura varieties for abelian fourfolds with an automorphism of order five
    [Hauptseminar Algebra und Zahlentheorie]
57. 14.04.2011, Universität Bonn/MPI:
    Shimura varieties for abelian fourfolds with an automorphism of order five
    [Seminar Algebraic Geometry]
58. 31.03.2011, Uniwersytet Pedagogiczny, Krakow:
    Lines on Fermat surfaces
59. 28.03.2011, Uniwersytetu Jagiellońskiego, Krakow:
    Shimura varieties for abelian fourfolds with an automorphism of order five
60. 14.03.2011, Oslo University:
    Oversiktsforedrag over modularitet til Calabi-Yau variteter
    [Seminar in Algebra and Algebraic geometry]
61. 24.11.2010, Nagoya University:
    Lines on Fermat surfaces
    [Workshop Lattices, Reflection groups and Algebraic Geometry]
62. 18.11.2010, Technische Universität Darmstadt:
    Arithmetik und Geometrie algebraischer Flächen
63. 29.10.2010, Lorentz Center, Leiden:
    Shimura varieties for abelian fourfolds with an automorphism of order five
    [Conference Arithmetic of Surfaces]
64. 30.09.2010, Copenhagen University:
    Lifts of projective congruence groups
65. 29.09.2010, Copenhagen University:
    Noncongruence groups and modular forms
66. 07.09.2010, Levico Terme, Italy:
    Arithmetic of singular Enriques surfaces
    [Conference Perspectives on Algebraic Varieties]
67. 16.08.2010, Universität Duisburg-Essen:
    Arithmetic of algebraic surfaces
68. 01.06.2010, Universita' degli Studi di Milano:
    Arithmetic of Enriques surfaces
    [Algebraic Geometry Seminar Milano]
69. 21.05.2010, Goethe-Universität Frankfurt
    Modulformen und K3-Flächen
70. 11.05.2010, Leibniz Universität Hannover
    Modularität und K3-Flächen
    [Antrittsvorlesung im Mathematisch-Physikalischen Kolloquium]
71. 23.04.2010, Utrecht University:
    Arithmetic of K3 surfaces
    [Dutch Mathematical Congress]
72. 08.03.2010, Hausdorff Institute, Bonn:
    Elliptic surfaces
    [Seminar: Algebra and Number Theory]
73. 17.02.2010, Tokyo University:
    Non-liftable Calabi-Yau spaces
    [Algebraic Geometry in characteristic p and related topics]
74. 15.02.2010, Nagoya University:
    Enriques surfaces and jacobian elliptic K3 surfaces
    [Algebraic Geometry Seminar]
75. 13.01.2010, Carl von Ossietzky Universität, Oldenburg:
    K3-Flächen und Modulformen
    [Colloquium]
76. 21.12.2009, Leibniz Universität Hannover:
    Calabi-Yau threefolds: fiber products of rational elliptic surfaces
    [Colloquium of the DFG graduate school 1463]
77. 20.11.2009, Freie Universität, Berlin:
    Arithmetic of Enriques surfaces
    [NoGAGS]
78. 17.11.2009, Universität Hamburg:
    K3 surfaces and modular forms
    [Colloquium for pure mathematics]
79. 30.09.2009, Harvard University:
    Arithmetic of Enriques surfaces
    [Number Theory Seminar]
80. 10.09.2009, Chuo University, Tokyo:
    Lines on Fermat surfaces
81. 02.09.2009, Rikkyo University, Tokyo:
    Arithmetic of Enriques surfaces
    [Workshop on K3, Enriques and Special Surfaces]
82. 01.09.2009, Tokyo University:
    Arithmetic of K3 surfaces
    [Algebraic Geometry Seminar]
83. 12.06.2009, Heinrich-Heine-Universität, Düsseldorf:
    Arithmetik und Geometrie von K3 Flächen
84. 17.04.2009, Utrecht:
    K3 surfaces and modular forms
    [Joint AKLS - InterCity seminar on modular forms in Utrecht]
85. 19.01.2009, Jussieu, Paris:
    K3 surfaces and modular forms
    [Seminaire de theorie des nombres de Chevaleret]
86. 01.12.2008, Banff, Canada:
    K3 surfaces and modular forms
    [Arithmetic of K3 surfaces]
87. 12.11.2008, KIAS, Seoul:
    K3 surfaces and modular forms
    [Algebraic Geometry in East Asia]
88. 06.11.2008, Nagoya University:
    Neron-Severi groups of surfaces in characteristic 0 and p
    [Algebraic Geometry in Positive Characteristics and Related Topics]
89. 31.10.2008, Hiroshima University:
    K3 surfaces and modular forms
    [Algebra seminar]
90. 14.10.2008, Humboldt Universität, Berlin:
    K3 surfaces and modular forms
    [Research seminar Algebraic Geometry]
91. 10.10.2008, University of Copenhagen:
    Surfaces with maximal Picard number
    [KU Number Theory Seminar]
92. 23.09.2008, Leibniz Universität Hannover:
    Arithmetik von K3 Flächen
93. 15.09.2008, Albert-Ludwigs Universität Freiburg:
    K3-Flächen und Modulformen
94. 12.06.2008, Leibniz Universität Hannover:
    K3-Flächen vom Picard Rang 20
    [Research Seminar Algebraic and Arithmetic Geometry]
95. 02.06.2008, Uniwersytetu Jagiellońskiego, Krakow:
    K3 surfaces and modular forms
    [Seminar on algebraic and analytic geometry]
96. 18.03.2008, Queen's University, Kingston, ON:
    K3 surfaces of Picard rank 20
    [Queen's Number Theory Seminar]
97. 17.03.2008, Queen's University, Kingston, ON:
    Lines on Fermat surfaces
    [Queen's Algebraic Geometry Seminar]
98. 15.03.2008, Fields Institute, Toronto, ON:
    K3 surfaces and modular forms
    [Workshop on algebraic varieties]
99. 17.01.2008, Universität Duisburg-Essen:
    K3 surfaces and modular forms
    [Oberseminar Algebraische Geometrie Duisburg-Essen-Düsseldorf]
100. 12.01.2008, Courant Research Center Göttingen:
     K3 surfaces and modular forms
     [Courant-Colloquium]
101. 10.01.2008, Leibniz Universität Hannover:
     K3-Flächen und Modulformen
     [Research Seminar Algebraic and Arithmetic Geometry]
102. 18.12.2007, University of Copenhagen:
     K3 surfaces and modular forms
     [Copenhagen Mathematics Colloquium]
103. 03.12.2007, MIT, Cambridge, MA:
     K3 surfaces of Picard rank 20 over Q
     [MIT STAGE]
104. 13.11.2007, MIT, Cambridge, MA:
     Calabi-Yau threefolds as fibre products of rational elliptic surfaces
     [Harvard/MIT algebraic geometry seminar]
105. 30.10.2007, Brandeis University, Waltham, MA:
     Singular K3 surfaces
     [Everytopic Seminar]
106. 13.09.2007, University of Texas, Austin, TX:
     Singular K3 surfaces
     [University of Texas - algebra, number theory and combinatorics seminar]
107. 06.09.2007, Rikkyo University, Tokyo:
     Singular K3 surfaces
     
108. 29.08.2007, Nagoya University:
     Singular K3 surfaces and modular forms
     [Conference on Birational Automorphisms of Compact Complex Manifold and Dynamical Systems]
109. 16.08.2007, Queen's University, Kingston, ON:
     Singular K3 surfaces and modular forms
110. 27.03.2007, Amherst College:
     Singular K3 surfaces
     [Amherst Five College Number Theory Seminar]
111. 26.02.2007, Boston University:
     Singular K3 surfaces
     [Boston University Algebra Seminar]
112. 08.02.2007, Georg-August-Universität Göttingen:
     Singuläre K3 Flächen
     [Events calendar of the mathematical faculty Göttingen (German)]
113. 21.12.2006, Rheinische Friedrich-Wilhelms-Universität Bonn:
     Singular K3 surfaces
     [Bonn mathematics events calendar]
114. 09.12.2006, CMS Winter 2006 Meeting:
     Classifying singular K3 surfaces
     [Session on Calabi-Yau Varieties and Mirror Symmetry]
115. 14.11.2006, Rice University, Houston:
     Classifying singular K3 surfaces
     [Rice Algebraic Geometry Seminar]
116. 24.10.2006, Harvard University:
     Classifying singular K3 surfaces
     [Harvard/MIT Algebraic Geometry Seminar]
117. 21.10.2006, Fields Institute, Toronto:
     CM-modular forms and Calabi-Yau varieties
     [Workshop on Algebraic Varieties]
118. 04.10.2006, Harvard University:
     CM newforms with rational coefficients
     [Harvard/ Number Theory Seminar]
119. 08.07.2006, Lauenbrück Seminar:
     Elliptic modular surface for the commutator subgroup of SL(2,Z)
120. 16.03.2006, Universita' degli Studi di Milano:
     Modularity of Calabi-Yau varieties
     [Number Theory Seminar Milano]
121. 02.02.2006, Universita' degli Studi di Milano:
     Calabi-Yau threefolds as fibre products of elliptic surfaces
     [Algebraic Geometry Seminar Milano]
122. 20.12.2005, University Duisburg-Essen, Germany:
     Arithmetic of singular K3 surfaces and Hecke eigenforms
     [DFG-Research group "Arithmetic and Geometry"]
123. 09.08.2005, AMS Summer Institute on Algebraic Geometry, University of Washington, Seattle, USA:
     Arithmetic of K3 surfaces
     [2005 AMS Summer Institute on Algebraic Geometry]
124. 28.04.2005, University of Hannover, Germany:
     Hecke eigenforms with complex multiplication and rational coefficients
     [Oberseminar AKG Hannover]
125. 18.03.2005, University of Groningen, Netherlands:
     Extremal elliptic K3 fibrations
     [Intercity number theory seminar]
126. 25.11.2004, University of Hannover, Germany:
     Singular K3 Surfaces
     [Oberseminar AKG Hannover]
127. 16.11.2004, University of Mainz, Germany:
     On the modularity of certain fibre products of the rational elliptic modular surface of level 5
     [Gästeseite AG Mainz]
128. 05.04.2004, University of Hannover, Germany:
     Modular Calabi-Yau threefolds arising from the modular elliptic surface of level 5
     [AKG Miniworkshop]
129. 23.03.2004, Duke University, Durham, NC, USA:
     New examples of modular rigid Calabi-Yau threefolds
     [Duke AG, Spring 2004]