- 1987-1988 "Some tests of normality based on transforms", Talks given at: University of Toronto, California State University at Fullerton, CA; Cornell University, NY; University of Rochester, NY; University of North Carolina at Chapel Hill, NC.
- 1989 Normality testing with transforms, Regional IMS meeting, University of California Davis, California, USA.
- 1990 Testing normality and symmetry via integral transforms, Texas A&M University, College Station, Texas, USA.
- 1992 "Slowly decaying correlations, testing normality, nuisance parameters" Invited talk, 12th conference on probability and statistics in the atmospheric sciences, June 22-26, 1992. Toronto, Canada.
- 1994 "Some topics on testing with the empirical characteristic function." Joint ASA-IMS-Bernoulli Society meeting, Chapel Hill, North Carolina, USA 1994.
- 1994 Chair of the session on EM algorithms, Joint ASA-IMS-Bernoulli Society meeting, Chapel Hill, NC, USA, 1994.
- 1994 "A new graphical tool to detect non-normality." Invited talk, Meeting of the Swiss Statistical Society, Bern, Switzerland.
- 1994 "Analysis of the forest damage inventory data in Switzerland". Seminar für Statistik, ETH, Zürich, Switzerland.
- 1995 "Bootstrap analysis of a forest health monitoring data". 21st European Meeting of Statisticians, Aarhus, Denmark.
- 1996 "On slope estimation in a semiparametric regression model with longmemory errors". 4th World Congress of the Bernoulli Society, Vienna, Austria.
- 1997 "Nonparametric conditional quantile estimation in the presence of long memory". 3rd International Conference on Statistical Data Analysis based on the L1-Norm and Related Methods, University of Neuchatel, Switzerland.
- 1997 "Selected problems in nonparametric and semiparametric statistics with applications in the environmental sciences". Technische Universität München, Fakultät für Mathematik, Munich, Germany.
- 1998 "Stratified Random Sampling - An Introduction". University of Neuchatel, Swutzerland.
- 1998 "SEMIFAR models in an analysis of some tree ring data". International Congress of Ecology (INTECOL), Florence, Italy.
- 1999 "Replicated time series with applications". 52nd Session of the International Statistical Institute (ISI), Helsinki, Finland.
- 2000 "Some applications of the moment generating function". Fachbereich Statistik, Universität Dortmund, Germany.
- 2001 "Quantile estimation to assess extreme climate events". Invited talk, Meeting of the European Geophysical Society, 26 - 30 March, Nice, France.
- 2002 "Estimation and prediction for linear processes". Invited talk, The 22nd International Symposium on Forecasting, Trinity College, Dublin, Ireland.
- 2002 "Estimating the moment generating function of a linear process". Invited talk. 4th International Conference on Statistical Data Analysis based on the L1-Norm and Related Methods, University of Neuchatel, Switzerland.
- 2002 Organizer of Invited session: Quantile estimation, 4th International Conference on Statistical Data Analysis based on the L1-Norm and Related methods, University of Neuchatel, Switzerland.
- 2002 "Nonparametric estimation and prediction of trend functions for time series", Invited talk, Statistische Woche, University of Konstanz, Germany.
- 2003 "Speaking of trend ...", Audit-Landscape, Special seminar series, January 2003, WSL, Birmensdorf, Switzerland.
- 2003 Chair and Organizer of the Invited and Contributed sessions on "Statistical Methods and their Applications" at the International Symposium on State of the Art in Vegetation Monitoring Approaches, 24-26 March, 2003, WSL, Birmensdorf, Switzerland.
- 2003 "On nonparametric smoothing for one dimensional transformations of Gaussian processes", Invited talk, 54th Session of the International Statistical Institute, Berlin, Germany.
- 2004 "The T3 plots", Department of Statistics, University of Calcutta, Kolkata, India.
- 2004 "Moment generating function estimation for linear processes", 6th World Congress of the Bernoulli Society and Probability and 67th Annual Meeting of the Institute of Mathematical Statistics, Barcelona, Spain.
- 2005 "On estimating species-area relationships - author's vocabulary and related counting problems." Seminar für Statistik, ETH, Zürich, Switzerland.
- 2005 "Selected problems related to inference for distribution functions", School of Mathematical and Computer Sciences, Heriot-Watt University, Edinburgh, Scotland, UK.
- 2005 "On the empirical cumulant generating function of some stationary long-memory processes", 25th European Meeting of Statisticians, Oslo, Norway.
- 2005 "Species counting", Department of Mathematics, University of York, York, UK.
- 2006 "An algorithm for age-depth modeling", Invited talk, Festschrift conference in honor of Professor Brigitta Ammann, Möschberg, Bern, Switzerland.
- 2007 "On species counting", 56th Session of the International Statistical Institute, Lisbon, Portugal.
- 2008 "Testing normality of a long-memory sequence using the empirical moment generating function.", Joint Statitsical Meetings (JSM), Denver, Colorado, USA.
- 2010 "Nonparametric estimation of distribution functions for Gaussian subordination models and applications", Invited Session on "Nonparametric Inference". Also, organizer and chair of the Special Invited Session on "Long Memory Processes". International Indian Statistical Association (IISA) Conference, Jan 4-8, 2010, Visakhapatnam, Andhra University, Waltair, India.
- 2010 "Applications of Gaussian Subordination Models in Climate Research", Session on "Stochastic Processes & Graphs", Joint Statitsical Meetings (JSM), Vancouver, British Columbia, Canada.
- 2011 "Gaussian subordination models on a lattice with environmental applications", Session on "Methods for non-Gaussian data", Joint Statitsical Meetings (JSM), Miami Beach, Florida, USA.
- 2011 "Some nonparametric regression problems for Gaussian subordinated time series observations with long-memory." Speaker & chair; Session on "Statistical Modelling: Environment", International Statistical Institute (ISI), Dublin, Ireland.
- 2012 "Some nonparametric curve estimation problems with applications to instrumental & proxy climate data", Invited talk, Session on "Statistical Issues in Climate: Past and Future" (Organizer: John Haslett, Trinity College, Dublin). Also, Session chair: Invited session on "Energy and Environment Related Issues for Sustainable Development" (Organizer: M. N. V. Prasad, University of Hyderabad, Hyderabad) and member of the Best Poster Judging Committee, 22nd Annual Conference of The International Environmetrics Society (TIES), Jan 3 - 6, 2012, University of Hyderabad, India.