Andrew's research focusses on the catenae on the Gospels. In his article "", published today in Novum Testamentum, he shows that all instances of the so-called "Western Order" in Greek gospel books copied after the sixth century are due to the set of related gospel catenae on Matthew, John, and Luke in those manuscripts. In fact, these earliest catenae on the gospels are found in a number of different, non-traditional sequences, unlike those of later tradition. Again, the comprehensive new analysis in this publication draws on the complete listing of New Testament catena manuscripts provided by the .