Paul Tillich

German-American theologian. Tillich'sSystematic Theology (1951-1964) defines religion as the most ultimate of all human concerns, identifies god with the ground of all being, and treats religious language and ritual as symbolic. InThe Courage to Be (1952) Tillich employed central concepts from existentialism to recommend a life of personal authenticity in the face of cultural and political obstacles.

Taken from:
http://www.philosophypages.com/dy/t9.htm#till

Also see:
http://www.dividingline.com/private/Philosophy/Philosophers/Till/LifeT.shtml
http://www.mythosandlogos.com/Tillich.html
http://www.erraticimpact.com/~20thcentury/html/tillich.htm
http://people.bu.edu/wwildman/WeirdWildWeb/courses/mwt/dictionary/mwt_themes_755_tillich.htm
http://www.theology.ie/theologians/tillich.htm