I can personally vouch for this gentleman. Forgive the cliche but he certainly is a leader in his field. I'm not the poster referred to, but 'Cyclops' was - with amazing swiftness -able to resolve an historical genealogical conundrum that had plagued me for years, and managed to do so whilst listening to the City on the radio !
Regarding books, remember that none other than Charles Dickens achieved fame and popularity not through 'books', but regular articles in magazines such as the 'Strand'.
Which reminds me 'Cyclops', I may be back in touch !!