The poet Pentti Saarikoski (1937-1983) was one of the most significant Finnish writers of the 20th century. He was also a prolific translator, who received many prestigious awards for his literary production. Throughout his life Saarikoski showed evidence of a certain psychopathology and mental complications for which he was twice hospitalized. The paper argues that Saarikoski possessed a large number of autistic traits and elevated symptomatology of ADHD. The traits of these conditions are often found in persons with high creative achievement. The works of the psychiatrist Michael Fitzgerald provide the theoretical background, on which the biographic evidence from Saarikoski’s childhood and adult life is analyzed. The identity diffusion under which the poet suffered can be shown as beneficial to this level of creativity. Saarikoski was an autistic writer, who visualized his poetry which eventually provided him with artistic identity. In addition to autistic traits and high intelligence, Saarikoski also sought novelty and sensation, which can be attributed to his ADHD traits.