He was born Ernst Lothar Müller, and as Müller is a very common German surname, he dropped it. His brother, Hans Müller-Einigen, by contrast, added a surname.
Biography
Lothar was born in Brünn, Austria-Hungary (now Brno in the Czech Republic) and died in Vienna. Amongst his novels was The Angel with the Trumpet and The Prisoner. In 1943 he published Beneath Another Sun (Doubleday, Doran & Co., Inc., Garden City, N.Y.). It was evidently written in exile as the foreword is signed Colorado Springs, Summer, 1942.
He was married to the Austrian actress Adrienne Gessner. They both fled into exile following the 1938 Anschluss.
The Angel with the Trumpet (1944), made into films of the same name in 1948 and 1950; republished in 2015 as "The Vienna Melody", translated by Elizabeth Reynolds Hapgood
The Prisoner: A Novel (1945), translated by James Austin Galston
The Door Opens (1945), translated by Marion A. Werner; illustrated by Garth Williams