Abroad

1.   4th World Congress of Bernoulli Society, talk  (Viena 1995)
2.   22nd European Meeting of Statisticians.
       7th Vilnius Conference on Probability Theory and Mathematical Statistics,
         talk    (Vilnius 1998)
3.   Sain-Flour Summer School on Probability Theory (France, 1998)
4.   Conference on Applied Probability, talk (Lund, Sweden 1998)
5.   Concentrated advanced course on stochastic simulation (Aarhus, Denmark, 1999)
6.   Temups programme  (Lund, Sweden, 1999)
7.  10th INFORMS Applied Probability Conference, talk (Ulm, Germany, 1999)
8.   Workshop on stochastic simulation (Aarhus, Denmark, 2000)
9.   Temups programme (Kopenhaga, Denmark, 2000)
10. Talk (Berlin, Germany, 2000)
11. Talk (Eindhoven, Netherlands, 2000)
12. Hamburger Stochastik-Tage, talk (Hamburg, Germany, 2000)
13. Workshop on Fluid Queues (Eindhoven, The Netherlands, 2000)
14. Workshop on ' Stochastic Models of Manufacturing and Logistic Systems'
       (Eindhoven, The Netherlands, 2001)
15. Workshop ' Spin Glasses ' (Eindhoven, The Netherlands, 2001)
16. Workshop on ' Stochastic Analysis : Geometric aspects and applications'
       (Eindhoven, The Netherlands, 2001)
17. Public Symposium: Qrandom plus (Eindhoven, The Netherlands, 2001)
18. Queueing Colloquium, talk  (Amsterdam, The Netherlands, 2001)
19. 26th Conference on the Mathematics  of Operations Research
       (Lunteren, The Netherlands, 2001)
20. Conference on stochastic processes and their applications, talk
       (Cambridge, England, 2001)
21. 11th INFORMS Applied Probability Society Conference, talk 
       (New York, USA, 2001)
22. The Mathematics of Stochastic Networks (Eindhoven, The Netherlands, 2001)
23. Queueing Qolloquium  (Amsterdam, The Netherlands, 2001)
24. 27th Conference on the Mathematics  of Operations Research
       (Lunteren, The Netherlands, 2002)
25. 38ste Nederlands Matematisch Congres (Eindhoven, The Netherlands, 2002)
26. Queueing Colloquium  (Amsterdam, The Netherlands, 2002)
27. Performance 2002 (Rome, Italy, 2002)
28. 24th Meeting of Statisticians,14th Prague Conference on Information Theory,
       Stat. Decision Functions and Random Processes, talk (Prague, Czech, 2002)
29. Workshop: Analysis and optimization of stochastic networks with application
       to telecommunications and manufacturing (Eindhoven, The Netherlands, 2002)
30. Stochastic meeting Lunteren (Lunteren, The Netherlands, 2002)
31. Queueing Qolloquium (Amsterdam, The Netherlands, 2002)
32. 28th Conference on the Mathematics of Operations Research
       (Lunteren, The Netherlands, 2003)
32. Dependence in extreme value theory (Eindhoven, The Netherlands, 2003)
33. Reinsurance (Eindhoven, The Netherlands, 2003)
34. Utrecht University, invited talk (The Netherlands, 2003)
35. Delft University, invited talk (The Netherlands, 2003)
36. Exotic option pricing under advanced Lévy models
        (Eindhoven, The Netherlands, 2004)
37. QPA/SOR Seminar, invited talk (Eindhoven, The Netherlands, 2004)
38. Stochastic Finance 2004 (Lisbon, Portugal, 2004)
39. Stafcolloquium, invited talk (Utrecht, The Netherlands, 2004)
40. Fourth Symposium on Levy Processes: Theory and Applications
       (Manchester, UK, 2005)
41. 4th Winter School on Financial Mathematics (Lunteren, The Netherlands, 2005)
42. Workshop: Rare events in communication networks
        (Eindhoven, The Netherlands, 2005)
43. Workshop: Queues, fluid Queues and extremes, talk 
        (Eindhoven, The Netherlands, 2006)
44. Join EURANDOM Queueing and Performance Analysis/SOR Seminar, invited talk
        (Eurandom, The Netherlands, 2006)
45. 31st Conference on Stochastic Processes and their Applications, talk 
        (Paris, 2006)
46. 4th International Conference: Limit Theorems in Probability Theory 
         and Their Applications, talk (Novosibirsk, Russia, 2006)
47. Bath University, seminar, talk (Bath, UK, 2006) 
48. Queueing theory without limits: transient and asymptotic analysis, talk
       (Eurandom, The Netherlands, 2007)
49. Queueing Seminar, invited talk (Tokyo, Japan, 2007)
50. Join EURANDOM Queueing and Performance Analysis/SOR Seminar, invited talk (Eindhoven, The Netherlands, 2008)
51. Stochastic Network Conference (Paris, France, 2008)
52. The 7th World Congress in Probability and Statistics, talk (Singapore, 2008)
53. EURANDOM Queueing and Performance Analysis Seminar, invited talk (Eindhoven, The Netherlands, 2008)
54. 100 years of queueing - The Erlang Centennial (Copenhagen, Denmark, 2009)
55. 33rd Conference on Stochastic Processes and Their Applications, talk (Berlin, Germany, 2009)

Poland

1. XXIV Ogolnopolska Konferencja Zastosowan Matematyki, talk (Zakopane, 1995)
2. XXVI Ogolnopolska Konferencja Zastosowan Matematyki, talk (Zakopane, 1997)
3. V Konferencja Probabilistyki, talk (Poraj, 1998)
4. Applied Probability and Advanced Communications Networks, talk (Bedlewo, 2003)
5. VIII Konferencja Probabilistyki, talk (Bedlewo, 2004)
6. Statystyka Aktuarialna - stan i perspektywy rozwoju w Polsce, talk (Wroclaw, 2005)
7. Spotkania Probabilistyczne, talk (Warszawa, 2005)
8. Stochastic Networks and Related Topics, talk (Bedlewo, 2006)
9. X Konferencja Probabilistyki, talk (Bedlewo, 2008)

1.  Department of Operation Research, The University of  North Carolina,
      Chapell Hill, USA (invited by Prof. V. Kulkarni, July, 2001)
2.  School of Industrial and Systems Engineering, Georgia Institute of Technology,
      USA (invited by Prof. H. Ayhan, July, 2001)
3.  Computer Science Department of the École Normale Supérieure, France
       (invited by Prof. B. Blaszczyszyn, May, 2002)
4.  Heriot-Watt University, Department of Actuarial Mathematics and Statistics,
       Scotland (invited by Prof. S. Foss and Prof. S. Zachary, Dec., 2002 and Oct., 2003)
5.  Université de Pau, Laboratoire De Mathématiques Appliquées, France
     (invited by Prof. F. Avram, July, 2003, July, 2005 and July, 2006)
6. The University of Manchester, UK (invited by Prof. R. Doney, Jan., 2005)
7.  Eurandom, The Netherlands (invited by Prof. B. Zwart, March, 2006)
8.  Heriot-Watt University, Department of Actuarial Mathematics and Statistics,
      Scotland (invited by Prof. A. Kyprianou, 2006)
9.  Sobolev Institute of Mathematics, Siberian Branch of Russian Academy of
      Sciences, Russia (invited by Prof. D. Korshunov, August, 2006)
10. Bath University, UK (invited by Prof. A. Kyprianou, 2006)
11. Tokyo University of Science, Japan (invited by Prof. M. Miyazawa, November, 2007)
12. Eurandom, The Netherlands (invited by Prof. A. Lopker and Prof. O. Boxma, April, August, 2008)
13. Universite d'Angers, France (invited by Prof. L. Chaumont, April, 2009) )
14. Eurandom, The Netherlands (invited by Prof. A. Lopker and Prof. M. Vlasiou, October, 2009)
15. RICAM, Austria (invited by Prof. Corina Constantinescu, November, 2009)