| 7th of September, 2023: | Seminar at NUMA research group, KU Leuven, Belgium |
| 13-18th of August, 2023: | Recent Trends in Graph Decomposition, Schloss Dagstuhl, Germany |
| 15th of April, 2023: | Keynote on Algebraic Programming at GraphSys '23, Coimbra, Portugal |
| 26th Feb.–3rd of March, 2023: | SIAM CSE 2023 |
| 21st of February, 2023: | Faculty of Informatics, USI, Lugano |
| 26th-28th September, 2022: | Huawei STW, Zürich, Switzerland |
| 20th September, 2022: | IEEE HPEC '22, GraphBLAS BoF, virtual |
| 5th-9th September, 2022: | SIAM ACDA Workshop, Aussois, France |
| 27th-29th June, 2022: | ACM PASC, Basel, Switzerland |
| 20th-23rd June, 2022: | HiPEAC, Budapest, Hungary |
| 30th May–3rd June, 2022: | IPDPS '22 (virtual) |
| 23rd-26th February, 2022: | SIAM PP '22 (virtual) |
| 11th–15th February, 2020: | SIAM CSC20 & SIAM PP20, Seattle, WA, USA
|
| 20th–22th January, 2020: | HiPEAC, Bologna, Italy
|
| 2016-2020 | ...list not properly maintained between these years... |
| 7th-10th March, 2018: | SIAM Conference on Parallel Processing for Scientific Computing (SIAM PP18), Tokyo, Japan
|
| 12th-15th April, 2016: | SIAM Conference on Parallel Processing for Scientific Computing (SIAM PP16), Paris, France
|
| 15th November, 2015: | 5th Workshop on Irregular Applications: Architectures and Algorithms (IA3 2015), Austin, TX, USA
|
| 15th-20th November, 2015: | Supercomputing 2015 (SC15), Austin, TX, USA |
| 7–9 October, 2015: | The fortieth Woudschoten Conference, Zeist, the Netherlands |
| 2–3 July, 2015: | 8th International Symposium on High-Level Parallel Programming and Applications, Pisa, Italy |
| 21–23 July, 2014: | The Sixth SIAM Workshop on Combinatorial Scientific Computing, Lyon, France |
| 18–21 February, 2014: | SIAM conference on Parallel Processing for Scientific Computing, Portland, Oregon, USA |
| 4–6 December, 2013: | New Algorithms for Exascale Computing, Köln, Germany |
| 2–4 October, 2013: | Woudschoten Conference 2013, Zeist, the Netherlands |
| 10–13 September, 2013: | Parallel Computing 2013, Munich, Germany |
| 1–2 July, 2013: | 6th International Symposium on High-level Parallel Programming and Applications 2013, Paris, France |
| 20–21 March, 2013: | 10th Intel EMEA HPC Roundtable, London, UK |
| 25 October, 2012: | Exascale Labs Workshop on Programming Models, Leuven, Belgium |
| 8–9 November, 2012: | Meet the European Exascale Labs, Santa Clara, CA |
| 19 September, 2012: | Guest lecture within the course Parallel Algorithms (by Rob Bisseling) at Utrecht University, the Netherlands |
| 10–14 September, 2012: | Visiting the Universitè della Svizzera italiana, Lugano, Switzerland as a guest of Prof. dr. Olaf Schenk and Dr. Matthias Christen |
| 4–11 February, 2012: | Visiting the Santa Clara area as a guest of Rob van der Wijngaart (Intel) |
| 15–17 February, 2012: | SIAM Conference on Parallel Processing for Scientific Computing |
| 18–24 February, 2012: | Visiting Berkeley as a guest of Aydın Buluç (LBL) and Jim Demmel (UCB) |
| 5–7 October, 2011: | Thirty-sixth Woudschoten Conference |
| 8 June, 2011: | KU Leuven / Intel ExaScience Lab, Leuven, Belgium |
| 19–21 May, 2011: | SIAM Workshop on Combinatorial Scientific Computing (CSC11), Darmstadt, Germany |
| 13–15 May, 2011: | PhDays 2011 |
| 24–28 January, 2011: | Study Group Mathematics 2011 (SWI2011), VU Amsterdam, Netherlands |
| 1st of December 2010: | 26th SARA Superdag |
| 6-8th of October 2010: | Thirty-fifth Woudschoten Conference |
| 26-30th of July 2010: | ECMI 2010 |
| 18-20th of June 2010: | PhDays 2010 |
| 14-23th of May 2010: | Visiting Olaf Schenke and Madan Sathe at the University of Basel |
| March 9, 2010: | Visiting Prof. Mitsuhisa Sato at Tsukuba University, Japan |
| March 2, 2010: | Visiting Prof. John Gilbert at University of California, Santa Barbara CA, USA |
| February 23-26, 2010: | SIAM Parallel Processing 2010, Seattle WA, USA |
| November 23, 2009: | The Apple Userday; High Performance tour of Mac OSX universe, Utrecht, NL |
| October 7-9, 2009: | The Thirty-fourth Woudschoten Conference, Zeist, NL |
| April 24-26, 2009: | PhDays 2009, Schaijk, NL |
| February 1-6, 2009: | Dagstuhl Seminar on Combinatorial Scientific Computing, Schloss Dagstuhl, DE |
| January 30, 2009: | Experiences with the GPU and the Cell Processor, Delft, NL |
| January 13, 2009: | Meeting NMWP, Eindhoven, NL |
| October 8-10, 2008: | 33rd Woudschoten Conference, Zeist, NL |
| May 30-June 1, 2008: | PhDays '08, de Haan, BE |
| March 12-14, 2008: | SIAM Conference on Parallel Processing for Scientific Computing (PP08), Atlanta GA, USA |
| December 7, 2007: | BRICKS Scientific Computing Meeting, CWI Amsterdam, NL |