East Pennsboro Township-based Gannett Fleming Inc. will reach the 100-year milestone in 2015. The global infrastructure firm has grown from one office in Harrisburg to 65 offices and a worldwide presence. One of the top private companies in Central Pennsylvania, based on reported revenue, Gannett Fleming is working with Michael Barton, professor of American studies and social sciences at Penn State Harrisburg, to produce a book documenting the company’s history. The book will coincide with the commemoration.

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