Annette Landgraf is Research Fellow and a member of the editorial office of the Hallische Händel-Ausgabe. She is co-editor of the Cambridge Handel Encyclopedia (2009), and editor of the Händel-Jahrbuch. She has published extensively on Handel subjects and is a specialist in editing and reception history. Helen Coffey is Senior Lecturer in Music at the Open University, a Council Member of The Handel Institute and co-editor of the six-volume George Frideric Handel: Collected Documents She has additionally published on various aspects of German and Austrian musical culture c.1500–c.1750.