In 1985 , he once more joined the Thalia Theatre , where he worked as leading director for the next fifteen years .
Which became , under his executive , one of the artistically and economically most successful voice theatres in Germany .
In 1985 , he once more joined the Thalia Theatre , where he worked as leading director for the next fifteen years and which became , under his executive , one of the artistically and economically most successful voice theatres in Germany .