• Erdos Centennial, 2013 , Budapest, Talk: On properties of families of setsVariations of Separability
• Winter School, 2012 , Heinice, Talk: Variations of Separability
• TOPOSYM 2011, Prague, August 13 - 19, 2011, Talk: Cardinal sequences
• Winter School, 2010 , Heinice, Talk: The joy of elementary submodels
• 24th Summer Conference on Topology and Its Applications , Brno , 2009. Talk: Cardinal sequences of scattered spaces
• KOBE 2009 , Wien , 2009. Talk: Chromatic number and conflict free chromatic number of almost disjoint file systems.
• ESI workshop on large cardinals and descriptive set theory , Wien , 2009. Talk: On properties of families of sets
• Winter School, 2009 , Heinice, 2009. Talks: Forcing without tears Brute forcings, Forcings and combinatorics, 2, Forcings and combinatorics, 3
• Logic Colloquium 2008, ASL European Summer Meeting , Bern, Switzerland, July 3-8, 2008. Talk: Rainbow Colourings
• Advances in Set-Theoretic Topology, Erice, Sicily, Italy, June 9 - 19, 2008. Talk: Resolvable spaces
• 1st European Set Theory Meeting, Bedlewo, Poland, July 9 - 13, 2007, Talk: Universal locally compact scattered spaces
• Horizon of Combinatorics, Budapest July 10-15 and Lake Balaton July 16-22, 2006 Talks:
  • EMS Summer School: Infinite Combinatorics: from Finite to Infinite
  • Conference: On the border of finite and infinite
• Combinatorial Set Theory, University of Florida, September 15 - 17, 2006, Talk: Indestructible properties
• TOPOSYM 2006, Prague, August 13 - 19, 2006, Talk: First countable countably compactifications of first countable spaces