Much speculation has gone on about who the writer of Hebrews is. In most KJV bibles you will find the title "The Epistle of Paul the Apostle to the Hebrews" and the oldest complete copy that we have, in the Chester Beaty papyrus is situated with the other Pauline epistles immediately following Romans. But in all other epistles of Paul, we find Paul cited in text as author. There are also some other difficulties when trying to place this book in Paul's authorship; The writer considers himself a second generation Christian, the eloquence of the Greek language used, as well as some dating issues, conservatively Hebrews was written between 60-70AD but if you try and pinpoint the date more specifically, many scholars would place the writing near or after the death of Paul, making him and unlikely candidate. There are also many stylistic differences in the writing. The eloquent use of Greek, The letter flows well, no traditional Pauline heading(Paul an apostle of Christ to...).

So if not Paul then who? Several people meet the criteria for authorship. The author would need to be a Jew, second generation Christian, alive as late as 70AD(pre-temple destruction), well educated in Old Testament as well as well versed in tabernacle instruction, friend of Timothy, and looked for no credit in authorship. Some suggested authors have been Paul, Paul with Luke translating into Greek, Luke, Clement of Rome, Barnabas, Silas, Priscilla, Epaphras, and Apollos. Many scholars now believe Apollos to be the most likely candidate.

In any event, no matter who the author of Hebrew may be, I think that it is quite clear who the author is, God. This book found its way into the cannon of scripture and deservingly so, without a concrete answer for who the author is. God had a message to send and He sent it and used someone anonymously to do it.

Hebrews reflects that position in looking to it's authorship. The entire book is pointing to Christ as supreme over angles, Patriarchs, Priests,... The writer of Hebrews makes it clear that Jesus is above all and over all creation.

From the beginning of the book we see God ways God spoke. Through prophets, angels, his son,... then through the rest of the book we see citations of God speaking, The author quotes the old testament and cites God as speaking it. Because God authored the old testament and God authored the new testament as well as Hebrews.

Hebrews 1:1-4