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It was while she was married to Archie Christie that Agatha Christie, nee Miller, wrote and published her first novel, the Mysterious Affair at Styles.  That marriage lasted for less than fourteen years, ending in divorce at about the time of the publication of her ninth book, The Mystery of the Blue Train, but her career as a writer of crime fiction continued for a further half-century and a further eighty-five titles (excluding the plays).  Having become known to a vast reading public as Agatha Christie, the author continued to use that name for professional purposes throughout the rest of her life, although privately she became Mrs Max Mallowan soon after her divorce from Christie.
-Charles Osborn, The Life and Crimes of Agatha Christie:  A Biographical Companion to the Works of Agatha Christie