"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; and, 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.