Charles Edward Pietri, a longtime member of the Institute of Nuclear Materials Management, helped set policy for national research and development laboratories across the country and is credited with contributing to the safe and effective control of nuclear materials.

“He was a strong supporter of nuclear energy, while at the same time a staunch advocate of the nonproliferation of nuclear weapons,” said his wife, Bettina.

Mr. Pietri, 81, a retired chemist with the U.S. Department of Energy’s New Brunswick Laboratory on the site of the Argonne National Laboratory, died of acute leukemia Friday, Feb. 10, in his Western Springs home.

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