Torben Knudsen was born in 1958 in Aarhus, Denmark. He received his MS from the Technical University of Denmark in 1983. The PhD degree was obtained in 1990 at the Institute for Mathematical Modeling at the same university. In 1986 he was at Wind Energy and Atmospheric Physics Department at Risø National Laboratory working as a research assistant. From 1987 until 2002 he has been at Department of Electronic Systems Section of Automation And Control, Aalborg University, Denmark both as assistant and associate professor. In the period 2002-2006 he was with Vestas Wind Systems A/S R&D as a control development engineer. Since 2006 he is again working at Section of Automation and Control. His main research areas are stochastic systems, state estimation, system identification and control. Concerning applications he has been working mostly with wind energy in various project on single turbine control, floating turbines and wind farm operation.