Erratum.
The recent obituary notice for Ward Evans [Science 349, 126 (23 Aug. 1957)] contains the inaccurate statement that he was the "lone member of the Atomic Energy Commission's special three-man Personal Security Board of 1954 who ruled that J. R. Oppenheimer was a loyal citizen." It is correct that Evans was the only member of the board who recommended that Oppenheimer should retain his security clearance; however, the majority report affirmed emphatically the belief that Oppenheimer was a loyal citizen and pointed out his eminent services to his country.