Deissmann the Philologist is the first in-depth biographical appraisal of the many once celebrated academic achievements (later mostly overlooked) of the German theologian Gustav Adolf Deissmann (1866–1937). While this authoritative book focuses to some extent on Forschungsgeschichte (history of classical scholarship), it also includes significant aspects of New Testament and religious studies, archaeological projects in Turkey, 20th century German social, political and church history, the ecumenical movement, and peace studies. It is, therefore, an indispensable work for a broad range of scholastic fields. An important added feature of this exceptionally source-rich work is the substantial collection of relevant appendices and addenda, which consist of transcribed documentary material that would otherwise remain largely unknown or inaccessible to most readers.