Paul.
Hebrews reads very much like a formal and proper, yet flexible type of 'midrash' to me; and Paul would be best suited to write in such a way, with his rabbinic background.
As to why it would not read like his letters, my reasoning is that as those are informal, whereas Hebrews is formal.
Then there is church history and Timothy:
In my Trinitarian Bible Society Bible there is a 'subscription' to the Hebrews Text which reads:
'Written to the Hebrews from Italy by Timothy.'
And yet, on their own site (
Subscriptions to the Epistles - Trinitarian Bible Society), TBS argues against Timothy as the author (as they are removing the subscriptions in certain new prints):
'6. The Epistle to the Hebrews, apparently (from the subscription), was written ‘from Italy by Timothy’, but this is wholly without foundation and plainly contradicts the inspired writer’s own words in 13.23—‘Know ye that our brother Timothy is set at liberty; with whom, if he come shortly, I will see you’.'
What I am wondering though, is what the church history is behind choosing Timothy?