Peter Thomsen is a respected geophysicists currently employed at Ramboll, a large consultant company operating in most parts of the world. For the last 15 years he has been involved in the Danish national groundwater mapping program. He graduated (M.Sc. in environmental geophysics) from University of Aarhus in 1998, and apart from Ramboll, has been employed as a research assistant at the University of Aarhus, Geoscience. In this position Thomsen had a great influence on development of geophysical equipment, setting up standards and optimizing measurement procedure used in the geophysical mapping program.