2020WAMS SchoolLattices, Diophantine Approximation and Heights Urgench State University, Urgench, Uzbekistan August 1721, 2020 WAMS School Algebra and Cryptography for students The University of Georgia, Tbilisi, Georgia June 22  June 30, 2020 CIMPA research school on Group Actions in Arithmetic and Geometry Universitas Gadjah Mada Yogyakarta, Indonesia February 1728, 2020 
2019The Twelfth International Conference on Mathematics and Mathematics Education in Developing Countries,The National University of Laos, Laos, November 13. International Conference on Class Groups of Number Fields and Related Topics2019 HarishChandra Research Institute, Allahabad, India, October 1619. Baikal Number Theory, The island of Olkhon (Baikal lake), Russia, August 2630. General Assembly of CIMPA Université Paris Descartes, Paris, June 28th. Maths Day for Development UNESCO House, Paris, March 15th. CIMPA research school on Elliptic curves: arithmetic and computation Universidad de la República, Montevideo, Uruguay, February 11  22.  
2018The Eleventh International Conference on Mathematics and Mathematics Education in Developing Countries,The National University of Laos, Laos, November 24. International Conference on Class Groups of Number Fields and Related Topics2018, HarishChandra Research Institute, Allahabad, India, October 811. Nepal Algebra project final exam 2018, Tribhuvan University, Kirtipur, Kathmandu, Nepal, October. Recent Developments on the Arithmetic and Geometry of K3 Surfaces, Fondazione Bruno Kessler, Povo, Trento July 1113. General Assembly of CIMPA Université Paris Descartes, Paris, June 29th. Emil Artin International School in Mathematics for Students a Wams school on The mathematics of Artin's conjectures Yerevan State University, Yerevan, Armenia May 21st 25th. CIMPA research school on Explicit Number Theory the University of the Witwatersrand, Johannesburg, South Africa, 8  19 Gennaio 2018.  
2017The Tenth International Conference on Science and Mathematics Education in Developing Countries,Mandalay University, Mandalay, The Republic of the Union of Myanmar, November 1012 Modern algebra and classical algebraic geometry: togheter with Edoardo Sernesi, CIRMFondazione Bruno Kessler, Trento, 2124 Giugno 2017. Numeration, Università Roma Tre, June 59. CIMPAICTP research school: Artin Lfunctions, Artin's primitive roots conjecture and applications, Nesin Mathematical village Sirinice, Turchia, May 29th  Giugno 5th. Sixth International Conference and Workshop on Basic and Applied Science, Salahaddin University Erbil, Kurdistan Region/IRAQ, MArch 18  19. WAMS research school on Topics in algebraic number theory and Diophantine approximation, Mathematics Department, College of Science, Salahaddin University Erbil, Kurdistan Region/IRAQ, March 12  17. 16th Conference on Applied Mathematics (APLIMAT 2017), Slovak University of Technology, Bratislava, Slovacchia, January 31st  Febraury 2nd 

2016CIMPAICTP research school on Lattices and applications to cryptography and coding theory,Saigon University , Ho Chi Minh City, Vietnam, August 112 Leuca2016, Celebrating Michel Waldschmidt's 70th birthday June 1317. Patù, Lecce. Dynamics and Graphs over Finite Fields: Algebraic, Number Theoretic and Algorithmic Aspects, Luminy, March 29th  Aprile 2nd.  
2015Geometry of algebraic varieties on the occasion of Sandro Verra's 65th,Humboldt University, Berlin October 69. Terzo Incontro Italiano di Teoria dei Numeri, Centro De Giorgi, Pisa, September 2124. Silvermania, Providence, Rhode Island, U.S.A, August 1015. XXXth Journées Arithmétiques, Debrecen, Hungary, July 610. Colloquium GRIFGA 2015, Gargnano sul Garda, April 1518. 

2014Counting arithmetic objects (Ranks of elliptic curves),CRM Montreal, November 1014. 

2013Heights in Diophantine Geometry, Group Theory and Additive Combinatorics,Erwin Schrödinger International Institute for Mathematical Physics, Vienna, November 2430. Thue 150, Bordeaux, September 30th October 5th. A CIMPAICTP research school on Algebraic Curve over Finite Fields and applications, University of the Philippines Dillman, Manila, July 22nd  August 2nd, 2013 Heights and moduli spaces, Lorentz center, Leiden June 1014. 

2012DMV annual meeting 2012,Universität des Saarlands, Saarbrücken, Sepetmber 1721. 

2011XXVII th Journées Arithmétiques,Vilnius, June 26th July 1st. 

2010Number Theory and its application,Debrecen, October 48. Number Theory and Representation Theory, Harvard University, Cambridge. June 25. 

2007XXV Journées Arithmétiques,Edimburgo, July 26. 

2004Sa Conjectura de Catalan,Menorca, Septmber 15. Motives, KTheory And Arithmetical Geometry, Sestri Levante, June 28th  July 2nd. Canadian Number Theory Association 8th Meeting, Toronto June 2026. The Brownawell conference, University of Waterloo, June 1719. The Analogy between Number Fields and Function Fields, Texel island, April 2529. Conféerence étducative sur l'hyperbolicité et l'arithmétique, Luminy, April 59. 

2003Secondo convegno Italiano di Teoria dei Numeri,Parma November 1315. Noncommutative aspect of Number Theory, Durham, August 28 September 5. XXIII Journées Arithmétiques, Graz, July 612. Geometry of the FourierMukai transform, schoolworkshop, Levico Terme June 1520, 2003. 

2002Modular Curves and Abelian Varieties,Barcellona July 1518. École d' été sur la conjecture de Birch et SwinnertonDyer, Parigi, July 412. Explicit Methods in Galois Theory and Arithmetic, Leiden, June 1014. Canadian Number Theory Assiociation VII Meeting, Montreal, May 1925. 

2001Anabelian number theory and geometry,Leiden, December 35. 

2000Arithmetic Geometry workshop,MSRI Berkeley, December 1015. Curves and Abelian Varieties over finite fields, Anogia, July 29  August 4. 

1999Elliptic Curves, Modular Forms and Galois Representations,Roma, July 1923. Journées Arithmétiques XXI, Roma, July 1216. Moduli of Abelian Varieties, Texel Island, April 2529. Advances in number theory, Leiden, April 1223. Rational and Algebraic Points on Varieties, Paris, February 24, Kortewegde Vries Institute for Mathematics, University of Amsterdam, JanuarySeptmber 

1998Kortewegde Vries Institute for Mathematics,University of Amsterdam, OctoberDecember Mathematical Institute, Oxford University, MayJune. Rational Points, Cambridge, March 30th April 4th. Current Trend in Arithmetical Algebraic Geometry, Cambridge, March 2328, !988 

1997Number Theory and Arithmetical Geometry,S. Feliu de Guixols, October 2429. Journées Arithmétiques XX, Limoges, September 1620. Instructional Conference on Algebraic Independence, Luminy, Septmber 29 October 3. Summer school on elliptic curves, ICTP, Trieste, August 1129. 

1996An instructional conference on curves over number field,Lunteren, December 1618. European School in Group Theory, Schloss Hirschberg, Beilngries, Septmber 214. 

1995A conference in Number Theory and Fermat Last Theorem,Boston, August 919. Journées Arithmétiques XIX, Barcelona, July 1620. Primo Incontro Itatdano di Teoria dei Numeri, Universit\`a Roma Tre, Roma, January 35. 

1994Giornate di Geometria Algebrica II,Universit\`a di L'Aquila, L'Aquila, January 1013. 

1993Workshop on Diophantine Geometry, MSRI, Berkeley, March 29  April 3. 

1991Barsotti Memorial Symposium,Abano Terme June 2429. 