The National Institute of Social Sciences mourns the passing of Clarence F. Michalis on March 30. He was 96. A longtime member of the National Institute, Mr. Michalis served on its executive committee and as president from 2001 to 2006. He was a former executive at First National City Bank and then Bristol-Meyers Squibb. He served as mayor of Lattingtown, Long Island, for more than 45 years, becoming the longest-serving mayor in the history of New York State.