About the Author: Terje Aven, University of Stavanger, Norway.?Terje Aven is Professor of risk management and the Principal Researcher at the International Research Institute of Stavanger (IRIS). He's worked both in industry (5 years) and academia (20 years). In that time he has participated in, and led, many safety and risk related projects, and has won several awards for both research and teaching. He has published numerous papers in international journals and has authored several books.