PERSONNEL: Changes of the Week, Apr. 25, 1955

¶J. Sinclair Armstrong, 39, a Chicago corporation lawyer before he became a member of the Securities and Exchange Commission in 1953. was named chairman of the SEC by President Eisenhower. Armstrong, a Harvard graduate ('38), got his law degree there in '41 and served as a Navy lawyer during World War II. He replaces Ralph H. Demmler, 50, chairman since 1953, who is returning to a private law practice in Pittsburgh. Andrew D. Orrick, 37, regional administrator of the SEC's San Francisco office, was nominated to fill the commission vacancy caused by Demmler's retirement and Armstrong's promotion. ¶Brigadier General Kenneth E. Fields, 46, will become general manager of the Atomic Energy Commission on May 1, succeeding Major General Kenneth D. Nichols, 47, who resigned the post he has held since 1953 to hang out his own shingle in Washington as a consulting engineer. Fields began his career in atomic energy in 1945 as an assistant to Major General Leslie Groves, moving to the AEC in 1947, where he became director of military application.