- Co-director of Reykjavik University Sustainability Institute and Forum (SIF), Reykjavik University, 2019 onwards. 

- Director of graduate studies, School of Science and Engineering, Reykjavik University, 2014-2016.

- Associate Professor, Department of Financial Engineering and Engineering Management, School of  Science and Engineering, Reykjavik University, 2013 onwards.

- Head of department, Department of Financial Engineering and Engineering Management, School of Science and Engineering, Reykjavik University, 2007-2011.

- Assistant Professor, Department of Financial Engineering and Engineering Management, School of Science and Engineering, Reykjavik University, 2007-2013.

- Centre for Process Systems Engineering, Imperial College London, Teaching and Research assistant, 2004-2006. 

Current research projects: 

- Simulation models for studying the transition towards sustainable mobility in Iceland and the Nordic countries. Study of transportation demand, energy production, environmental impact and macroeconomics with System Dynamics, Agent Based and DSGE models. 

- Optimization models for analyzing the optimal power mix, regional power trade and power storage in Eastern Africa. 

- Study of the potential use of renewable energy resources in the Arctic. Simulation models and economic analysis. 

- Optimization models and machine learning methods for optimization of strategies for sustainable utilization of geothermal resources. 

- Quantitative, dynamic simulation model of a food system used for developing policy interventions aimed at improving the fairness, resilience, sustainability and integrity of food systems. 

Selected publications: 

Perkin, S., Hamon, C., Kristjánsson, R., Stefánsson, H., & Jensson, P. (2019). Framework for trajectory-based probabilistic security assessment of power systems. IET Generation, Transmission & Distribution.

Shafiei, E., Davidsdottir, B., Fazeli, R., Leaver, J., Stefansson, H., & Asgeirsson, E. I. (2018). Macroeconomic effects of fiscal incentives to promote electric vehicles in Iceland: Implications for government and consumer costs. Energy Policy, 114, 431-443. 

Shafiei, E., Davidsdottir, B., Leaver, J., Stefansson, H., & Asgeirsson, E. I. (2017). Energy, economic, and mitigation cost implications of transition toward a carbon-neutral transport sector: A simulation-based comparison between hydrogen and electricity. Journal of Cleaner Production, 141, 237-247.  

Li, Y., Júlíusson, E., Pálsson, H., Stefánsson, H., & Valfells, Á. (2017). Machine learning for creation of generalized lumped parameter tank models of low temperature geothermal reservoir systems. Geothermics, 70, 62-84.  

Perkin, S., Svendsen, A. B., Tollefsen, T., Honve, I., Baldursdottir, I., Stefansson, H., ... & Jensson, P. (2017). Modelling weather dependence in online reliability assessment of power systems. Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, 231(4), 364-372.

Shafiei, E., Davidsdottir, B., Leaver, J., Stefansson, H., Asgeirsson, E. I., & Keith, D. R. (2016). Analysis of supply-push strategies governing the transition to biofuel vehicles in a market-oriented renewable energy system. Energy, 94, 409-421.  

Sigurdardottir, S. R., Valfells, A., Palsson, H., & Stefansson, H. (2015). Mixed integer optimization model for utilizing a geothermal reservoir. Geothermics, 55, 171-181.

Shafiei, E., Davidsdottir, B., Leaver, J., Stefansson, H., & Asgeirsson, E. I. (2015). Comparative analysis of hydrogen, biofuels and electricity transitional pathways to sustainable transport in a renewable-based energy system. Energy, 83, 614-627. 

E Shafiei, B Davidsdottir, J Leaver, H Stefansson, EI Asgeirsson . Potential impact of transition to a low-carbon transport system in Iceland. Energy Policy 69, 127-142, 2014.

G Saevarsdottir, P Tao, H Stefansson, W Harvey. Potential use of geothermal energy sources for the production of lithium-ion batteries. Renewable Energy 61, 17-22, 2014.

EJ Erlingsson, S Cincotti, H Stefansson, JT Sturlusson, A Teglio, M Raberto. Housing market bubbles and business cycles in an agent-based credit economy. Economics: The Open-Access, Open-Assessment E-Journal 8, 1-42, 2014.

Ólafsson, A., Margeirsson, S., Ásgeirsson, E.I., Stefánsson, H., Guðmundsson, R. and Arason, S. Quantitative methods for decision making in the fishing industry: A case study from Iceland, Journal of Natural Resource Modeling, 26 (3), 365-384, 2013. 

E. Shafiei, H. Stefánsson, E. I Ásgeirsson, B. Davíðsdóttir and M. Raberto , Integrated Agent-based and System-Dynamics Modeling for Simulation of Sustainable Mobility. Transport Reviews 33 (1), 44-70, 2013.

Erlingsson, E. I., Raberto, M., Alfarone, S., Stefansson, H. On the distributional properties of size, profit and growth of Icelandic firms. Journal of Economic Interaction and Coordination (JEIC), 1-18, 2012.   

E. Shafiei, H. Þorkelsson, E. I Ásgeirsson, B. Davíðsdóttir, M. Raberto and H. Stefánsson. An Agent- based Modeling Approach to Predict the Evolution of Market Share of Electric Vehicles: A Case Study from Iceland. Journal of technological forecasting and social change, 79 (9), 1638-1653, 2012. 

R. M. Ragnarsson, H. Stefánsson and E. I. Ásgeirsson. 2011. Meta-Heuristics in Multi-Core Environments. Systems Engineering Procedia, 1, 457-464. 2011. 

Stefansson, H., Sigmarsdottir, S., Jensson, P. and Shah, N. 2011, Discrete and continuous time representations and mathematical models for large production scheduling problems: A case study from the pharmaceutical industry, European Journal for Operations Research. 

Stefansson, H., Eyjolfsson, E.I., Olafsson, S. 2010. ICORS - Icelandic Operations Research Society, Wiley Encyclopedia of Operations Research and Management Science, INFORMS Transactions on Education. 

Stefansson, H., Jensson, P and Shah, N. 2009, A procedure for reducing the risk of delayed deliveries in make to order production, Journal of Production Planning and Control. 

Stefansson, H., Jensson, P and Shah, N. 2006, Multi‐scale Planning and Scheduling in the Secondary Pharmaceutical Industry, AIChE Journal.