Geijer was a noted historian, although he did not complete any one of the vast undertakings which he planned. Of the "Records of Sweden" (), which were to have embraced the history of his native country from mythical ages to his own times, he finished only the introductory volume. His "Svenska folkets historia" (3 vols., 1832–36), which was intended to form one of the series of European histories edited by Leo and Ukert, was not carried beyond the abdication of Queen Christina (1654), the reason probably being the author's conversion to liberalism in history and politics. It has been suggested, however, that Geijer's declaring for liberalism was perhaps as much coming-out-of-the-closet as it was a true conversion. Incomplete as they are, these works are highly regarded contributions to Swedish history. His "History of the Swedes down to Charles X" was translated into English by Turner, with biographical introduction (London, 1845).