His first book, Autogenic Training: A Psychophysiologic Approach in Psychotherapy, jointly authored with Schultz, appeared in 1959.[7][8] This was based on Schulz's 1932 book, and its subsequent updates, available only in German.[7] It was the first book-length presentation of autogenic training in English.[7][8] A six-volume series, Autogenic Therapy followed; the first three volumes were coauthored with Schultz; the last three were written independently following Schultz's death.[2][8][19] His numerous publications included journal articles and a training manual.[1][14]