What author was an ealdorman and had his poems edited by Alistair Campbell? 
Alistair Campbell (academic):  He was the editor of editions of the Old English poem "Battle of Brunanburh", Æthelweard's "Chronicon" and Æthelwulf's "De abbatibus". Æthelweard (historian): Æthelweard (also Ethelward; d. c. 998), descended from the Anglo-Saxon King Æthelred I of Wessex, the elder brother of Alfred the Great, was an ealdorman and the author of a Latin version of the "Anglo-Saxon Chronicle" known as the "Chronicon Æthelweardi".
Æthelweard