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EWEPA XI, June 23-26, 2009, Pisa, Italy: "Stochastic DEA: Myths and Misconceptions".

HECER Applied Micro Seminar, March 11, 2009, Helsinki, Finland: "Neoclassical versus Frontier Production Models? Testing for the Presence of Inefficiencies in the Regression Residuals".

Finnish Economic Association - Annual Meeting, February 5-6, 2009, Turku, Finland: "Weak Disposability in Nonparametric Production Analysis: Undesirable Outputs, Abatement Costs, and Duality".

DEA2009 Symposium, January 13-15, 2009, Osaka, Japan. Invited presentation: "DEA as Nonparametric Least Squares Regression".

Aston Seminar on Efficiency and Productivity Analysis, December 5, 2009, Aston Business School, Birmingham, UK. Invited presentation: "DEA as Nonparametric Least Squares Regression & Stochastic Nonparametric Envelopment of Data".

XIIth Congress of the European Association of Agricultural Economists (EAAE), August 26-29, 2008, Gent, Belgium. Oral presentation: "Stochastic Nonparametric Envelopment of Data (StoNED): Cross-sectional Frontier Estimation Subject to Shape Constraints".

V North American Productivity Workshop (NAPW), June 24-27, 2008, New York City, USA. Oral presentation: "Stochastic Nonparametric Envelopment of Data (StoNED) in the Case of Panel Data".

2nd Halle Workshop on Efficiency and Productivity Analysis – HAWEPA, May 26-27, 2008, Halle, Germany. Oral presentations: "Stochastic Nonparametric Envelopment of Data (StoNED): Cross-sectional Frontier Estimation Subject to Shape Constraints", and "Measuring Productivity Differentials An Application to Milk Production in Nordic Countries.

XXX Annual Meeting of the Finnish Society for Economic Research, February 13 – 14, 2008, Jyväskylä, Finland. Oral presentation: "Directional Nonparametric Least Absolute Deviations Method for Estimating the Boundary of a Convex Set".

Maataloustieteen Päivät, January 10 – 11, 2008, Viikki (Helsinki), Finland. Oral presentation: "Mistä johtuu kasvava ero elintarvikkeiden vähittäismyynti ja tuottajahintojen välillä?".

EEA/ESEM 2007, August 27 – 31, 2007, Budapest, Hungary. Oral presentation: "Representation Theorem for Convex Nonparametric Least Squares".

EURO XXII, July 8 – 11, 2007, Prague, Czech Republic. Oral presentation: "Stochastic Nonparametric Envelopment of Data: Combining Virtues of SFA and DEA in a Unified Framework".

EWEPA X, June 27-30, 2007, Lille, France. Oral presentation: "Stochastic Nonparametric Envelopment of Panel Data: Frontier Estimation with Fixed and Random Effects Approaches". Poster presentation: "Stochastic Nonparametric Envelopment of Data: Cross-sectional frontier estimation subject to shape constraints".

4th Nordic Econometric Meeting, 24-26 May 2007, Tartu, Estonia. Oral presentation: " Representation Theorem for Convex Nonparametric Least Squares".

GREMAQ econometrics seminar, February 23, 2007, Toulouse, France. Invited presentation: "Convex Nonparametric Least Squares and Its Microeconometric Applications".

The XXIX Annual Meeting of the Finnish Society for Economic Research, February 1-2, 2007, Lappeenranta, Finland. Oral presentation: "Representation Theorem for Convex Nonparametric Least Squares".

The Nordic Efficiency and Productivity Workshop, November 2006, Copenhagen, Denmark. Oral presentation: " Stochastic Nonparametric Envelopment of Data: Combining Virtues of SFA and DEA in a Unified Framework".

IV North American Productivity Workshop 2006, June 27-30, 2006, New York City, USA. Oral presentation: " Stochastic Nonparametric Envelopment of Data: Combining Virtues of SFA and DEA in a Unified Framework".

2nd International Eco-Efficiency Conference, 28-30 June Egmondt aan Zee, Netherlands. Chairman of session: "Modelling and Operational Methods - Frontier Approaches". Oral presentation: "Data Envelopment Analysis in the Environmental Valuation for Cost-Benefit Analysis Analysis".

Institute for Operations Research and Management Sciences annual meeting, 13-16 November, San Francisco, USA. Chairman of session: "Data Envelopment Analysis: Advances in Environmental Performance, Productivity, and Portfolio Efficiency Analysis", Oral presentation: "Weak Disposability of Undesirable Outputs in DEA".

NOMEPRE Symposium, 11 November, Wageningen, Netherlands. Oral presentation: "Convex Nonparametric Least Squares Frontier Estimation: A Marriage of SFA and DEA?".

CEMMAP Workshop - Testing Stochastic Dominance Restrictions, 4-5 November, London, UK. Oral presentation: "Performance Measurement and Best-Practice Benchmarking of Mutual Funds".

Econometric Society World Congress 2005, 19-24 August, London, UK. Chairman of session: "Productivity Measurement". Oral presentation: "On the Anatomy of Productivity Growth: A Decomposition of the Fisher Ideal TFP Index".

IX European Workshop of Efficiency and Productivity Analysis (EWEPA) , 29 June - 2 July, Brussels, Belgium. Oral presentations: "On the Minimum Extrapolation Principle of Data Envelopment Analysis" and "On the Anatomy of Productivity Growth: A Decomposition of the Fisher Ideal TFP Index".

14th Annual Meeting of the European Association of Environmental and Resource Economists, 23-26 June, Bremen, Germany. Chairman of session: "The Firm and the Environment II". Oral presentation: "Weak Disposability in Nonparametric Production Analysis with Undesirable Outputs".

46th Annual Conference of the Operational Research Society, 7-9 September, York, UK. Oral presentation: "The Law of One Price in Data Envelopment Analysis: Restricting Weight Flexibility Across Firms".

4th International DEA Symposium, 5-6 September, Birmingham, UK. Oral presentation: "Measuring Portfolio Efficiency of Mutual Funds: A New Stochastic Dominance –based DEA approach".

XX European Conference on Operational Research, 4-7 July, Rhodes, Greece. The semi-plenary presentation (MSSIP2004 prize): "The Law of One Price in Data Envelopment Analysis: Restricting Weight Flexibility Across Firms".

North American Productivity Workshop 2004, 22-25 June, Toronto, Canada. Chairman of session "DEA III". Oral presentation: "The Law of One Price in Data Envelopment Analysis: Restricting Weight Flexibility Across Firms".

International Eco-Efficiency Conference, 2-4 April, Leiden, Netherlands. Chairman of session "Approaches and Operational Methods". Presenter of paper: "Generalized indices of ecological efficiency for production activities generating multiple environmental bads"

Institute for Operations Research and Management Sciences annual meeting, 19-22 October, Atlanta, USA. Presenter of an invited paper: "Data Envelopment Analysis with Unbalanced Data".

Ympäristö- ja luonnonvarataloustieteen kollokvio, 15 October, Helsinki, Finland. Invited Presentation: "Efficient Portfolio Diversification according to Stochastic Dominance Criteria: Applications to Mixed-Asset Forest Portfolio Management and Environmentally Responsible Mutual Funds"

8th European Workshop of Efficiency and Productivity Analysis, 25-27 September 2003, Oviedo, Spain. Presenter of paper: "DEA and Stochastic Dominance Efficiency Analysis of Investment Portfolios: Do Evironmentally Responsible Mutual Funds Diversify Efficiently?"

European Association for Research in Industrial Economics annual conference, 24-26 August 2003, Helsinki, Finland.

EEA-ESEM annual congress, 20-24 August 2003, Stockholm, Sweden. Presenter of contributed paper: "Duality Theory of Non-convex technologies".

EURO/INFORMS joint international meeting, 6-10 July 2003, Istanbul, Turkey. Presenter of invited paper: "Using Stochastic Dominance criteria in Data Envelopment Analysis of mutual funds: The case of environmentally responsible funds".

EAERE Annual conference, 28-30 June 2003, Bilbao, Spain. Presenter of poster: "Does Ignoring Multi-Destination Trips in the Travel Cost Method Cause a Systematic Downward Bias?"

WIDER conference on Inequality, Poverty and Human Well-being, 30-31 May 2003, Helsinki, Finland. Presenter of contributed paper: "Benchmarking Sustainable Development: A Synthetic Meta-Index Approach ".

55th IAEC Conference, 12-16 March 2003, Vienna, Austria. Organizer and chairman of session: "Economies of Scale and Efficiency". Presenter of invited paper: "Duality Theory of Nonconvex Technologies".

INFORMS Annual Meeting, 17-20 November 2002, San Jose, USA. Organizer and chairman of the Session "Productivity Dynamics". Presenter of invited paper: "Synthetic Meta-index of Sustainable Development: A DEA Approach

International Conference on Risk and Uncertainty in Environmental and Resource Economics, June 5-7, 2002, Wageningen University, The Netherlands. Presenter of contributed paper: "Stochastic Dominance Portfolio Analysis of Forestry Assets

Tuottavuuden mittaus julkisella sektorilla -workshop, 7.5. 2002, Helsinki, Finland. Co-organizer and presenter of paper: "Tuottavuus, Tehokkuus ja Uusi Talous - tutkimusprojektin esittely" (In Finnish).

Nordic Mathematical Programming Symposium '01, November 15-17, 2001, Copenhagen, Denmark. Presenter of contributed paper: " Diversification in Stochastic Dominance Efficiency Analysis".

Exclusive Workshop on DEA, September 21-22 2001, Odense, Denmark. Presenter of invited paper: "Nonconvex Technologies".

16^th Annual Congress of the European Economic Association, August 29 - September 1 2001, Lausanne, the Switzerland. Presenter of contributed paper: "Shadow Price Approach to Productivity Measurement".

EURO2001 Conference, July 9-11 2001, Rotterdam, The Netherlands. Presenter of invited paper:"Shadow Price Approach to Productivity Measurement".