On his scientific work, A. C. Crombie writes When the Western Schism broke out in 1378, Henry sided with Pope Urban VI against Antipope Clement VII, and wrote various treatises in defence of the former.
In 1379 he composed "Epistola pacis" (see Helmstädter Program, 1779 and 1780) in which, under the form of a disputation between an Urbanist and a Clementine, he advocates the suppression of the schism by way of a general council or a compromise.
These two treatises of Henry, and the Epistola Concordiae of Conrad, formed the basis of a discourse delivered by Cardinal Pietro Philargi, the future Alexander V, at the first session of the Council of Pisa (26 March 1409; see Bliemetzrieder in Historisches Jahrbuch (Munich, 1904), XXV, 536-541).
Henry's Epistola concilii pacis is printed in von der Hardt's Concilium Constantiense, II, 1, 3-60, with the exception of the first and the second chapter, which were afterwards published by the same author in Discrepantia mss.
A letter which he wrote here to Bishop Eckard of Worms, and which bears the title De scismate was edited by Sommerfeldt in Historisches Jahrbuch (Munich, 1909), XXX, 46–61.