Philip Schaff was born and raised in Switzerland, educated in Germany, and emigrated to the United States in 1844. This work explores Schaff’s place in European-American history in the nineteenth century by treating him comprehensively, exploring his mind as an immigrant and a theologian and viewing him in all his interests and in the context of his entire life. He is renowned for his unique blend of German and American evangelicalism in the Mercersburg Theology and in advocating an early ecumenism in his work with the Evangelical Alliance and many other notables. Viewed through his eyes, Schaff gives the reader a unique and interesting perspective of the nineteenth century as a participant and an observer.