**2015**

- Ordered Algebraic Structures and Related Topics at the Centre International Recontres Mathematiques in Luminy, France, October 12 - 16, 2015. Talk presented: Witt equivalence of function fields over global fields
- Cohomological Methods in the Theory of Algebraic Groups at the Centre International Recontres Mathematiques in Luminy, France, August 31 - September 5, 2015.
- Linear algebraic groups, vector bundle classification and division rings in Lens, France, June 15 - 19, 2015.

**2014**

- Joint Conferences on Algebra, Logic and Number Theory: 15th Colloquiumfest on Algebra and Logic and 10th Czech, Polish and Slovak Conference on Number Theory in Będlewo, Poland, June 8 - 13, 2014.

**2013**

- International Conference on the Algebraic and Arithmetic Theory of Quadratic Forms in Puerto Natales, Chile, December 16 - 21, 2013. Talk presented: Counting Witts.
- Quadratic forms, A
^{1}-homotopy theory and exceptional groups in Lens, France, June 10 - 17, 2013.

**2012**

- Algebraic K-theory and arithmetic at the Stefan Banach International Mathematical Center in Będlewo, Poland, July 22 - 28, 2012.
- Joint Conferences on Algebra, Logic and Number Theory: 11th Colloquiumfest on Algebra and Logic and 9th Czech, Polish and Slovak Conference on Number Theory in Ostravice, Czech Republic, June 10 - 14, 2012. Talk presented: Quotients of spaces of orderings of arbitrary index.
- Galois cohomology, motives and cubic Jordan algebras in Lens, France, May 21 - 25, 2012.
- Scientific Session in honour of Friedrich Hirzebruch on the occasion of his 85th birthday at the Stefan Banach International Mathematical Center in Warsaw, Poland, May 18, 2012.
- Workshop Emerging Developments in Real Algebraic Geometry: Positivity, Convexity, NC-Geometry, Optimization at the Otto-von-Guericke-Universitat Magdeburg, Magdeburg, Germany, February 20-24, 2012. Talk presented: Quotients of spaces of orderings of arbitrary index.

**2011**

- Arithmetique, Algebre et Applications conference at the Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland, June 27-29, 2011.
- Real Algebraic Geometry conference at the Universite de Rennes 1, Rennes, France, June 20-24, 2011.
- K-Theory and Motives, UCLA, Los Angeles, March 22-25, 2011.

**2010**

- Convex Optimization and Algebraic Geometry workshop within Modern Trends in Optimization and Its Application program at the Institute for Pure and Applied Mathematics at UCLA, Los Angeles, September 28 - October 1, 2010.
- Algebraic Geometry, K-theory, and Motives at Euler International Mathematical Institute at the St. Petersburg Department of V. A. Steklov Institute of Mathematics of the Russian Academy of Sciences in St. Petersburg, Russia, June 25-29, 2010.
- Joint Conferences on Algebra, Logic and Number Theory: 9th Colloquiumfest on Algebra and Logic and 8th Czech, Polish and Slovak Conference on Number Theory in Bukowina Tatrzańska, June 21-24, 2010. Talk presented: Realizability of profinite spaces of orderings.
- Patching, Involutions and Buildings in Lens, France, June 14 - 18, 2010.
- Gdańsk-Kraków-Warsaw Seminar on Singularity Theory at University of Silesia in Katowice, Poland, April 9 - 10, 2010.

- Positivity, Valuations, and Quadratic Forms Conference in Konstanz, Germany, October 1 - 6, 2009. Talk presented: Certain quotient spaces of spaces of orderings and their inverse limits.
- Southern California Algebra Conference, UCLA, Los Angeles, April 4, 2009.

- Southern California Algebra Conference, UCLA, Los Angeles, November 22, 2008. Talk presented: The pp conjecture in the theory of spaces of orderings.
- Essential Dimension and Canonical Dimension in Lens, France, June 23 - 27, 2008. Talk presented: The pp conjecture in the theory of spaces of orderings.
- 7th Polish, Slovak and Czech Conference on Number Theory, Ostravice, Czech Republic, June 10 - 12, 2008. Talk presented: The pp conjecture in the theory of spaces of orderings.
- 5th Linear Algebra Workshop, Kranjska Gora, Slovenia, May 27 - June 1, 2008. Talk presented: The pp conjecture in the theory of spaces of orderings.
- 8th UCB/UCSB Noncommutative Algebra Day, UCSB, Santa Barbara, April 5, 2008.
- Southern California Algebra and Optimization Day at Caltech, Pasadena, March 6, 2008.
- Southern California Algebra Conference, UCLA, Los Angeles, February 23, 2008.

- International Conference on the Algebraic and Arithmetic Theory of Quadratic Forms 2007, Lake Llanquihue, Chile, December 13 - 19, 2007.
- Southern California Algebra Conference, UCLA, Los Angeles, December 8, 2007.
- Quadratic Forms, Triangulated Categories and Valuations in Lens, France, June 11 - 17, 2007.

- Mini-Conference Topics in Real Algebraic Geometry in Saskatoon, SK, October 5-6, 2006. Talk presented: The pp conjecture for the space of orderings of the field R(x,y).
- Quadratic Forms and Linear Algebraic Groups Conference in Oberwolfach, Germany, June 25 - July 1, 2006.
- 6th Polish, Slovak and Czech Conference on Number Theory at the Stefan Banach International Mathematical Center in Będlewo, Poland, June 13 - 16, 2006. Talk presented: On certain types of local-global principles in the reduced theory of quadratic forms.

- 6th Annual Colloquiumfest in Saskatoon, Canada, April 1 - 2, 2005.

**
Other conferences and meetings
**

**2009**

- 12th Annual Legacy of R.L. Moore Conference in Austin, TX, July 16-18, 2009.

- 11th Annual Legacy of R.L. Moore Conference in Austin, TX, July 10-12, 2008.

- CMS Winter Meeting 2006 in Toronto, ON, December 9 - 11, 2006.

- XIII Sesja Wyjazdowa KNM@UŚ (student conference) in Szczyrk, Poland, April 4 - 6, 2003.

- XII Sesja Wyjazdowa KNM@UŚ (student conference) in Szczyrk, Poland, November 15 - 17, 2002.
- Letnia Szkoła Instytutowa (local conference of the Institute of Mathematics, University of Silesia) in Szczyrk, Poland, September 22 - 27, 2002.
- II Letni Obóz KNM@UŚ (student summer camp) in Szczyrk, Poland, September 3 - 16, 2002.
- XXIX Szkoła Matematyki Poglądowej (general math conference) in Grzegorzewice, Poland, August 23 - 27, 2002.
- XI Sesja Wyjazdowa KNM@UŚ (student conference) in Szczyrk, Poland, March 15 - 17, 2002.

- I Letni Obóz KNM@UŚ (student summer camp) in Zarzecze, Poland, September 2 - 16, 2001.
- XXVI Szkoła Matematyki Poglądowej (general math conference) in Grzegorzewice, Poland, August 24 - 28, 2001.
- IX Sesja Wyjazdowa KNM@UŚ (student conference) in Zarzecze, Poland, March 30 - April 1, 2001.

- VIII Sesja Wyjazdowa KNM@UŚ (student conference) in Zarzecze, Poland, November 22 - 25, 2000.
- VII Sesja Wyjazdowa KNM@UŚ (student conference) in Zarzecze, Poland, April 21 - 23, 2000.

- VI Sesja Wyjazdowa KNM@UŚ (student conference) in Piaseczno, Poland, November 11 - 14, 1999.
- V Sesja Wyjazdowa KNM@UŚ (student conference) in Zarzecze, Poland, April 9 - 11, 1999.

- IV Sesja Wyjazdowa KNM@UŚ (student conference) in Zarzecze, Poland, November 12 - 15, 1998.
- III Sesja Wyjazdowa KNM@UŚ (student conference) in Zarzecze, Poland, April 24 - 26, 1998.