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Matthew Siegel has joined Insight Communications Co. Inc. as senior vice president of finance and treasurer. Siegel had been assistant treasurer at Joseph E. Seagram & Sons Inc. Alex Crowley has joined Insight as vice president, customer development. He had been district manager of retention marketing at AT & T Corp. Jerry Knights has been named vice president, telephone engineering. Knights had been regional technical operations manager for the MSO's system in Louisville, Ky.