He was appointed Ambassador to Austria in 1954 .
He was served as High Commissioner until Austria was released from Allied occupation ; during that time he completed the negotiations of , and signed , the Austrian Independence Treaty of May 1955 .
He was appointed Ambassador to Austria in 1954 , but served as High Commissioner until Austria was released from Allied occupation ; during that time he completed the negotiations of , and signed , the Austrian Independence Treaty of May 1955 .