BOSTON (CBS) – Boston’s longest serving mayor is about to write a book.

Mayor Tom Menino has cut a deal with Houghton Mifflin Harcourt to write about his time in office.

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“It’s about the 20 years. I took over 20 years ago as acting mayor and how we built on that into a city that stands alone in this country, that we’re proud of an we want to tell our story about it,” Menino told WBZ NewsRadio 1030.

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Menino is co-writing the book with author Jack Beatty, who grew up in Codman Square and wrote “The Rascal King” about former Boston mayor and Massachusetts governor James Michael Curley.

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The book should be out next spring.