Jef Tinel (1885-1972). I've already given you his biographical info, so, I won't bore you with that again...
"Fantasia" is another piece available for free download: http://imslp.org/wiki/Category:Tinel,_Jef
Like most of his other works for download, this piece is in manuscript.
This is mostly a "full organ" piece, with long pedal points, and a dark, folk-song quality to it. It is quite dramatic, and would probably be a great "Halloween" piece... ;-)
I think that the effectiveness of this piece would depend a lot on the organ and the acoustic, and it would be difficult to carry this off on a small organ in a dry acoustical environment.
It certainly bears NO resemblance to the earlier "Postludium" that I uploaded last week, as the musical language is MUCH more modern.
In a way, this piece reminded me of the works of Hendrik Andriessen.