I have just translated this book into Japanese. It took me no less than 2 years. As is well known, the main achievement of John R. Mott is that he promoted the eccumenical movement and paved the road to WCC (World Christian Council). During my translation, I found the parts of World War I and the Russian revolution the most provocative. It cannot be said that this book is easy to read, partly because the author intended to make this book the decisive biography (a few had been written before), utilizing a great amount of material. However, this book is not only extremely valuable as a document of the Christian Ecumenism but we can get a new perspective of the history of USA and the world from the late 19th century till 1950s.