The speaker is God
God is telling you and I that there is no one else like Him. He was here from the beginning, and he will be everlasting. There is no break in the existence of God, ever, He has always existed, and will continue to be. In the name "I am" God is telling us that He will be whatever He desires to be, and to whomever He choses. There is only one eternal way, and that is our Heavenly Father's way.
The Speaker is indeed GOD. The point of this thread is, to show those who believe that Jesus Christ is not GOD, that Jesus Himself says in Revelation, in three places,
1:17, "When I saw him, I fell at his feet as though dead. But he laid his right hand on me, saying, “Fear not, I am the first and the last"
2:8, "“And to the angel of the church in Smyrna write: ‘The words of the first and the last, who died and came to life"
22:13, " I am the Alpha and the Omega, the first and the last, the beginning and the end.”
Jesus Christ says of Himself, that HE IS The Eternal God, YHWH!