Johan Eklöf, PhD, is a Swedish bat scientist, ecologist, and author. His book on light pollution, The Darkness Manifesto, won the Penn Libraries Book Prize in Sustainability and has been been translated into sixteen languages. With nearly three decades of research experience, Eklöf is a recognized expert on bats, night ecology, and the ecological effects of light pollution. He lives in the west of Sweden, where he spends the warmer months in the field surveying bats and the winters writing.