In the field of New Testament research, his work (and also the work that he did together with his wife Barbara Aland in the Institute for New Testament Textual Research in Münster) is internationally acclaimed.
Dalam bidang riset Perjanjian Baru karyanya (dan juga karya yang dikerjakannya bersama istrinya, Barbara Aland, pada Institute for New Testament Textual Research di Münster) diakui menjadi panduan di seluruh dunia.