- Invited Speaker, BDVA 2015, "Big Data Visual Analytics", Tasmania, 2015, September.
- Invited Speaker, CGIV 2013, "Visual Analytics for Massive Complex Networks", University of Macau, Macau, 2013, August.
- Invited Speaker, PacificVAST 2013, "Visual Analytics for Massive Complex Networks", University of Sydney, Sydney, 2013, February.
- Invited Speaker, 2011 Winter School on Mathematical and Computational Biology, "Visualising and Analysing Massive Networks", University of Queensland, Brisbane, 2011, July.

- Invited Speaker,KOFST, Korean Federation of Science and Technology Societies) ULTRA (Universal Linkage for Top Research Advice) Workshop 2009, "Visualisation and Analysis of Large and Complex Networks", Seoul, Korea, December. 2009.

- Invited Speaker, KOFST (Korean Federation of Science and Technology Societies) ULTRA (Universal Linkage for Top Research Advice) Program 2009 IT & Communication, "Visualisation and Analysis of Large and Complex Networks", Sydney, October. 2009.

- Invited Speaker, 2009 Winter School on Mathematical and Computational Biology, "Visualisation and Analysis of Large and Complex Biological Networks", University of Queensland, Brisbane, 2009, July.

- Invited Speaker, RIMS 2008, Workshop on Acceleration and Visualisation of Computation for Enumeration Problems, "Visualisation and Analysis of Large and Complex Networks", RIMS, Kyoto, Japan, 2008, September.

- Invited Speaker, IWAAG 2007, The International Workshop on Algorithms and Graphs, Star-shaped Drawings of Graphs with Minimum Concave Corners, Japan, 2007, Dec.

- Invited Speaker, AWOCA 2006, Theory and Practice of Graph Drawing, 2006 July.

- Invited Speaker, ACAL 2005, Visualisation and Analysis of Large and Complex Networks, 2005 December.

- Workshop on Large-scale Network Analysis, Visualisation and Analysis of Large and Complex Networks, 2005 November.

- Dagstuhl Seminar on Algorithmic Aspects of Large and Complex Networks, Visualisation and Analysis of Large and Complex Scale-free Networks, September, 2005.

- Dagstuhl Seminar on Graph Drawing, Visualisation and Analysis of Large and Complex Networks, May, 2005.

- Spring Day: Workshop on Graph Drawing and Information Visualisation, Survey on Symmetric Graph Drawing, June, 2002.

- Symmetry Workshop, Drawing Trees Symmetrically in Three Dimensions, July, 2000.

- KAIST, Korea, "Theory and Practice of Graph Drawing: Visual Analytics of Massive Complex Networks", 2013 Dec.
- University of Konstanz, "Generalisation of Steinitz's Theorem, Tutte Theorem and Fary's Theorem", 2013 Oct.
- Technical University Dortmund, "Generalisation of Steinitz's Theorem, Tutte's Theorem and Fary's Theorem", 2013 June.
- KAIST, Korea, "Recent Advances in Graph Drawing: Extending Steinitz's Theorem, Fary's Theorem and Tutte's Barycenter Theorem", 2012 Jan.

- Seoul National University, Korea, "Recent Advances in Graph Drawing: Extending Steinitz's Theorem, Fary's Theorem and Tutte's Barycenter Theorem", 2012 Jan.

- National Tshing Hua University, Taiwan, "Symmetric Drawings of Series Parallel Digraphs in Three Dimensions", 2011, December.

- Karlsruhe Institute of Technology, Germany, "Extending Convex Drawings of Graphs", 2010 Nov.

- KAIST, Korea, "Graph-theoretic Characterisation of Non-convex Polyhedra", 2010 Jan.

- Seoul National University, Korea, "Visualisation and Analysis of Large and Complex Networks", 2010 Jan.

- CYRAM, Korea, "Visualisation and Analysis of Large and Complex Networks", 2010 Jan.

- Postech, Korea, "Visualisation and Analysis of Large and Complex Networks", 2009 Dec.

- Yonsei University, Korea, "Visualisation and Analysis of Large and Complex Networks", 2009 Dec.

- University of Rome Tre, Italy, "Extending Convex Drawings of Graphs", 2009, Oct.

- National Taiwan University, Taiwan, "Visualisation and Analysis of Large and Complex Networks", 2009, April.

- National Taiwan University, Taiwan, "Extending Convex Drawings of Graphs", 2009, April.

- ACADEMIA SINICA, Taiwan, "Extending Convex Drawings of Graphs", 2009, April.

- National Tshing Hua University, Taiwan, "Visualisation and Analysis of Large and Complex Networks", 2009, April.

- KAIST, Korea, "Extending Convex Drawings of Graphs", 2009, Jan.

- Seoul National University, Korea, Extending Convex Drawings of Graphs", 2009, Jan.

- Ewha University, Korea, "Visualisation and Analysis of Large and Complex Networks", 2009, Jan.

- Kyoto University, Japan, "Extending Convex Drawings of Graphs", 2008, Oct.

- JAIST, Japan, Visualisation and Analysis of Large and Complex Networks, 2007, Nov.

- JAIST, Japan, Theory and Practice of 2.5D Graph Drawing, 2007, Nov.

- Kyoto University, Japan, Theory and Practice of 2.5D Graph Drawing, 2007, March.

- Kyoto University, Japan, Visualisation and Analysis of Large and Complex Networks, 2007, March.

- Tohoku University, Japan, Theory and Practice of Graph Drawing: Visualisation and Analysis of Large and Complex Networks, 2007, Jan.

- KAIST, Korea, Theory and Practice of Graph Drawing: Visualisation and Analysis of Large and Complex Networks, 2007, Jan.

- Seoul National University, Korea, Theory and Practice of Graph Drawing: Visualisation and Analysis of Large and Complex Networks, 2007, Jan.

- IPK, Germany, Visualisation and Analysis of Large and Complex Networks, 2006 September.

- University of Queensland, IMB, Visualisation and Analysis of Large and Complex Networks, 2006 June.

- Charles Darwin University, Theory and Practice of Graph Drawing, 2006 June.

- CORE Chrice Wallace Seminar, University of Sydney, Theory and Practice of Graph Drawing, 2006 April.

- DSTO, Visualisation and Analysis of Large and Complex Networks, 2006 February.

- University of Sydney, Basser Seminar Series, June, 2005, Visualisation and Analysis of Large and Complex Networks

- Kyoto University, Japan, Symmetric Graph Drawing: an overview, March 2005.

- University of NSW, Visualisation and Analysis of Large and Complex Networks, November 2004.

- University of Karlsruhe, Germany, The Metro Map Layout Problem, May 2004.

- University of Konstanz, Germany, Symmetric Graph Drawing in Three Dimensions, May 2004.

- University of Lethbridge, Canada, Symmetric Graph Drawing: a survey, February 2004.

- University of Victoria, Canada, Symmetric Graph Drawing: a survey, January, 2004.

- JAIST, Japan, Symmetric Graph Drawing in Two Dimensions, February, 2003.

- JAIST, Japan, Symmetric Graph Drawing: a survey, January, 2003.

- KAIST, Korea, Symmetric Graph Drawing, January, 2003.

- Seoul National University, Korea, Graph Drawing and Information Visualisation, January, 2003.

- Brown University, USA, Department of Computer Science Seminar, Drawing Planar Graphs Symmetrically, March 19, 2001.

- National Taiwan University, Taiwan, Department of Electrical Engineering Seminar, Drawing Planar Graphs Symmetrically, December 21, 2000.

- University of Queensland, School of Computer Science and Electrical Engineering Seminar, Algorithms for Finding Planar Geometric Automorphisms in Planar Graphs, April 7, 2000.

- Australian National University, Department of Computer Science Seminar, Algorithms for Finding Planar Geometric Automorphisms in Planar Graphs, March 29, 2000.

- University of Western Australia, Department of Mathematics, Pure Mathematics Seminar, Algorithms for Finding Planar Geometric Automorphisms in Planar Graphs, March 22, 2000.

- University of Cologne, Germany, Drawing Series Parallel Digraphs Symmetrically, February 1999.

- Max-Planck-Institut fur Informatik, Saarbrucken, Germany, 1999. Drawing Series Parallel Digraphs Symmetrically, February 1999.

- Invited Speaker, 2011 Winter School on Mathematical and Computational Biology, "Visualising and Analysing Massive Networks", University of Queensland, Brisbane, 2011, July.

- Invited Speaker, 2009 Winter School on Mathematical and Computational Biology, "Visualisation and Analysis of Large and Complex Biological Networks", University of Queensland, Brisbane, 2009, July.

- JAIST, Japan, Visualisation and Analysis of Large and Complex Networks, 2007, Nov.

- JAIST, Japan, Theory and Practice of 2.5D Graph Drawing, 2007, Nov.

- CYRAM, Korea, Visualisation and Analysis of Large and Complex Networks, 2007, Jan.

- IPK, Germany, Visualisation and Analysis of Large and Complex Networks, 2006 September.

- University of Queensland, IMB, Visualisation and Analysis of Large and Complex Networks, 2006 June.

- DSTO, Visualisation and Analysis of Large and Complex Networks, 2006 February.

- Telstra Research Lab, Melbourne, Visualisation and Analysis of Large and Complex Networks, December 2004.

- University of NSW, Visualisation and Analysis of Large and Complex Networks, November 2004.

- Netmap Analytics, Sydney, Visualisation and Analysis of Large and Complex Networks, October 2004.

- JAIST, Japan, Symmetric Graph Drawing in Two Dimensions, February, 2003.

- JAIST, Japan, Symmetric Graph Drawing: a survey, January, 2003.

- CYRAM, Korea, "Visualisation and Analysis of Large and Complex Networks", 2010 Jan.

- CYRAM, Korea, Visualisation and Analysis of Large and Complex Networks, 2007, Jan.

- Telstra Research Lab, Melbourne, Visualisation and Analysis of Large and Complex Networks, December 2004.

- Netmap Analytics, Sydney, Visualisation and Analysis of Large and Complex Networks, October 2004.

- 2015 January Dagstuhl workshop on Empirical Evaluation for Graph Drawing

- 2015 January Shonan Meeting seminar on Big Graph Drawing: Metrics and Methods
- 2014 March Bertinoro workshop on Graph Drawing

- 2013 March Bertinoro workshop on Graph Drawing

- 2012 August Sunshine Coast Workshop on Algorithmics on Massive Data Sets

- 2012 August Byron Bay Workshop on Geometric Graph Theory

- 2012 June Dagstuhl workshop on Putting Data on the Map

- 2012 March Bertinoro workshop on Graph Drawing

- 2011 June Port Douglas Workshop on Geometric Graph Theory

- 2011 May Dagstuhl workshop on Graph Drawing with Algorithm Engineering Methods

- 2011 March Bertinoro workshop on Graph Drawing

- 2010 November Dagstuhl workshop on Schematization in Cartography, Visualization, and Computational Geometry

- 2010 August BlueMountain Workshop on Geometric Graph Theory

- 2010 March Bertinoro workshop on Graph Drawing

- 2009 May Dagstuhl workshop on Visualisation and Monitoring of Network Traffic

- 2009 March Bertinoro workshop on Graph Drawing

- 2008 May Dagstuhl workshop on Graph Drawing with Applications to Bioinformatics and Social Sciences

- 2008 March Bertinoro workshop on Graph Drawing: Visualisation of Large Graphs

- 2007 May Dagstuhl workshop on Information Visualization - Human-Centered Issues in Visual Representation, Interaction, and Evaluation

- 2007 March Bertinoro workshop on Graph Drawing and Computational Geometry

- 2006 March Bertinoro workshop on Graph Drawing

- 2005 September Dagstuhl workshop on Algorithmic Aspects of Large and Complex Networks

- 2005 May Dagstuhl workshop on Graph Drawing

- 1998 July Dagstuhl workshop on Graph Algorithms and Applications