Ullmann, Ludwig, 1887-.

Ullmann emigrated from Vienna to France in 1938 and to the U.S. in 1942. His friendship with Werfel apparently dated back to the early years of Werfel's career as a poet.

From the description of Correspondence with Alma Mahler and Franz Werfel, 1942-1948. (University of Pennsylvania Library). WorldCat record id: 155864658