Stefan Pettersson is an ecologist specializing in bats. Stefan completed his PhD in 2005 with his thesis "Bats and bat flowers in a West African rainforest community" and since 2006 has carried out bat surveys for the County Administrative Boards in Halland and Jönköping, amongst other clients. Since 2009 Stefan has carried out a large number of surveys and studies investigating the effects of planned wind farms on local bat populations. This last year he has also initiated several monitoring programmes at operational wind farms. Stefan also works with environmental impact assessment and ecological assessment.