Another strange Listener - looked impenetrable at a glance (ie failing to solve any across clue on first read) but had another look yesterday, got a start in the NE corner, and filled the grid in a few hours.
Found the three word name today, realised I hadn't got correct letters for the author's name, then found the connection between the five words. Still puzzling over the 18 letter phrase, can't see anything yet.
Apart from a school subject that connects the two themes I can't see how the named person relates to anything beyond a curve, so the phrase remains inscrutable.