Kaarlo Pentti Linkola was a prominent Finnish deep ecologist, ornithologist, polemicist, naturalist, writer, and fisherman. He wrote widely about his ideas and in Finland was a prominent thinker, and is linked by some authors to ecofascism and to authoritarian deep ecology. Linkola was a year-round fisherman from 1959 to 1995. He fished on Keitele, Päijänne and the Gulf of Finland, and since 1978 he fished on Vanajavesi.