Christian Bak is a Senior Scientist at the Technical University of Denmark at the department DTU Wind Energy and has carried out research at Risø Campus since 1997. His main activity is within theoretical and experimental airfoil and rotor aerodynamics. He has been designer and co-designer of the wind turbine dedicated Risø airfoils, which are used on MW rotors. Also, different concepts of rotor designs have been investigated, e.g. he is co-inventor on the use of active trailing edge flaps for wind turbines. Examples of his activities are the detailed aerodynamic full scale measurements on a 2 MW wind turbine rotor in the so called DAN-AERO MW project and several wind tunnel measurement campaigns. In the last years he has been the technical project manager of the establishment of the Poul la Cour Tunnel including planning, design and construction.