The author is not known.
Possible authors: Paul, Luke, Apollos, Barnabas, Priscilla and Aquila, Clement of Rome
Origen doubted Paul wrote it, but said only God knew the author.
In the Greek the author is aligned with Paul’s theology, but very different in several ways.
Tertullian wrote as though everyone knew that Barnabas wrote Hebrews.

The actual date is not known.
Clement of Rome refers to this book in 95 AD.
It can not be written after 70 AD when the temple in Jerusalem was destroyed since one of the main themes of the book is the
attempt to convince believers that temple worship is a dead work.
The temple seems to still be in operation in these verses: 8:4; 8:13; 9:6-9; 10:1-3
It was written during the lifetime of Timothy since he has just been released from prison.
If Paul was still alive Timothy would have joined him after his release.
If Paul is not the author, and most evidence show he is not, then Timothy is joining someone else which could mean Paul has already died.
This information puts the date at 68-69 AD.

The writer is familiar with the readers.
10:32-34 He knew of their Christian lifestyle when they first believed
6:10 He knew of their generosity
5:11-14 He knew their present spiritual condition
13:19,23 He planned on visiting them

It appears the readers where Jewish since the author lays heavy stress on Jewish tradition, scripture and temple worship
to show the necessity of the New Covenant in Christ.

The readers were being pulled back to the old covenant.
It seems that the readers were from Israel and had beliefs similar to those

1) The person and work of Jesus Christ.
Contributes to these doctrines concerning Jesus:
Substitutionary Death

2) Compares the Old and New Testaments

3) Old Testament Interpretation

4) Our life of Faith

The surpassing greatness of Christ
The words “better,” “perfect,” and “heavenly” are used to teach this greatness of Christ Christ is superior to:
1) Old Testament prophets (1:1-3)
2) Angels (1:4-2:8)
3) Moses (3:1-6)
4) Joshua (3:7-4:16)
5) Aaron’s priesthood (5:1-10:18)

Warning the readers not to give up what they have in Christ for the OT shadows. (10:1)

The readers are told to go onto maturity and achieve their reward as productive believers by fulfilling their calling.

They are given five warning passages: 2:1-4; 3:1- 4:13; 5:11-6:20; 10:26-39; 12:14-29

The superiority of Christ (1:1- 7:28)
The Superior Sacrificial Work of Christ the High Priest (8:1-10:39)
Final Appeal to Persevere in Faith (11:1-12:29)
Closing (13:1-25)