RIVERWOODS, Ill. - William Simmons has been named executive vice president for Novus Network Services, which is part of Dean Witter, Discover & Co.'s credit card operation.

Mr. Simmons, 47, formerly executive vice president and director of Dean Witter's municipal securities and unit investment trust division, replaced Robert Minemier, a spokeswoman said.

The Novus network works with merchant locations that accept Dean Witter's credit card brands, which include Discover, Bravo, and Private Issue.

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