Established in 1919, NSI (http://www.nsi1919.com) is a marketing services firm that provides major corporations with advertising intelligence, brand management, communications and creative solutions. NSI has been designated as St. Louis’ largest privately-owned advertising agency and has branch offices in New York City, Detroit, and Los Angeles. In 2005, NSI was purchased by The Frontenac Company, a 35-year-old Chicago-based private equity investment firm with more than $1 billion under active management