The author of Hebrews is debated. Some say it was Paul, and is widely accepted as such based on content. Some say it was a sermon given by Paul but transcribed by Luke. In fact, at times many other names have been suggested such as Barnabas, Clement of Rome, Luke, Silvanus, Philip the Evangelist, Priscilla and Apollos. In looking at the discussions of authorship regarding Hebrews, the last paragraph is often that it doesn't matter who wrote the book as it is an important book of the Bible and it, along with the rest of the Bible was inspired by the Holy Spirit and it would be treated as such.
Chapter 1 talks of how God used to talk to mankind though the prophets and now He speaks through His Son, Jesus Christ. He explains that His promises are fulfilled through His Son and that He created the universe through His Son. He further explains that His very character and glory are expressed in the Son, in fact, in John 14:9 Jesus said, "He that has seen me has seen the Father," which gives support that Jesus exhibits the nature and character of the Father.
We are directed to the fact that Christ has cleansed us from our sins and is now seated at the right hand of God in heaven. That statement clearly defines Christ' position as higher than the angels and goes on to express how the Son is worshipped and the angels are servants. The last verse of chapter 1 tells us that angels are spirits sent to care for those people who will inherit salvation.