No, I still don't know who Jason Aaron is.
I've seen his name in the Marvel solicitations, but I've never read anything he's written, nor do I know what comics he's done.
And I really don't care enough to look him up.
He currently writes the Vertigo series 'SCALPED', one of the
great crime comics of recent years. Easily up there with the Brubaker/Phillips 'Criminal' series.
He also written a bunch of Wolverine, Ghost Rider and Hellblazer issues, oh and a rather effective little war comic series called 'The Other Side' drawn by a certain Anglo/Canadian friend of ours.