So sad news. It was seeing what Maurice was doing in spectroscopy over 20 years ago that got me and many others into the field. The supernova spectroscopy work I am doing is a direct result of his measurements then and the prophecy he made when president that one day amateurs would be able to confirm and classify supernovae spectroscopically, which he lived to see fulfilled. He was an important champion of spectroscopy, encouraging me and others personally and helping to build the popularity it has today. He will be sadly missed by that community internationally.
Robin