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EWEPA XII, June 21-24 2011, Verona, Italy: " Cost efficiency analysis of electricity distribution networks: Application of the StoNED method in the Finnish regulatory model".

Finnish Operations Research Society - FORS seminar, June 8 2011, Helsinki, Finland: " Tehokkuusanalyysi paikallisten monopolien sääntelyssä: StoNED-menetelmän soveltaminen sähkön jakeluverkkotoiminnan valvonnassa ".

Finnish Economic Association - Annual Meeting, February 3-4 2011, Oulu, Finland: " Cost efficiency analysis of electricity distribution networks: Application of the StoNED method in the Finnish regulatory model".

Business Technology seminar, Aalto University School of Economics, November 12, 2010, Helsinki, Finland: " Cost efficiency analysis of electricity distribution networks: Application of the StoNED method in the Finnish regulatory model".

HECER lunch seminar, November 8, 2010, Helsinki, Finland: "Efficiency analysis as a principle-agent game: An application to the regulation of electricity distribution networks".

VI North American Productivity Workshop (NAPW), June 2-5, 2010, Houston, USA. Plenary talk: "Towards One-Stage Non-/Semiparametric Estimation and a Unified Framework". Oral presentation: "How Operational Conditions and Practices Affect Productive Performance? Efficient Semi-parametric One-Stage Estimators*.

VATT Microeconometrics Study Group, May 24, 2010, Helsinki, Finland: "Frontiers of Efficiency Estimation".

Finnish Economic Association - Annual Meeting, February 4-5, 2010, Tampere, Finland: "How Operational Conditions and Practices Affect Productive Performance? Efficient Semi-parametric One-Stage Estimators".

Maataloustieteen Päivät, January 12 – 13, 2010, Viikki (Helsinki), Finland. Oral presentation: " Kuinka ekologista kestävyyttä EI tulisi mitata?".

Institute for Operations Research and Management Sciences Annual Meeting, 11-14 October, San Diego, USA. Chairman of session: "Stochastic Nonparametric Approaches to Data Envelopment Analysis”. Oral presentations: “Data Envelopment Analysis as Nonparametric Least Squares Regression”, “Modeling Weak Disposability in Data Envelopment Analysis under Relaxed Convexity Axioms”, and “Productivity Differentials in Dairy Farming - A Comparison of Methods”

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.

Finnish Economic Association - Annual Meeting, 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".

Finnish Economic Association - Annual Meeting, 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".

Institute for Operations Research and Management Sciences 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".

EEA-ESEM, 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".