Ernst Jünger
Hofmann was a long-time friend and correspondent of German author and entomologist Ernst Jünger, whom he met in 1949. Jünger experimented with LSD with Hofmann; in 1970, Jünger published a book of his experiences taking several types of drugs, "Annäherungen. Drogen und Rausch" (Approaches: Drugs and Intoxication).