The answer is Jesus who is the Almighty God made incarnate.
Please excuse the amount of scripture quoted here, but I wanted to ensure sufficient was included to ensure immediate context. I wanted to link OT writting with NT revelation to ensure scriptural connection.
"Thus saith the LORD (Jehovah) the King of Israel, and his redeemer the LORD of hosts; I am the first, and I am the last; and beside me there is no God
Revelation of Jesus Christ 1:
12 Then I turned to see the voice that spoke with me. And having turned I saw seven golden lampstands, 13 and in the midst of the seven lampstands One like the Son of Man (Jesus), clothed with a garment down to the feet and girded about the chest with a golden band.
14 His head and hair were white like wool, as white as snow, and His eyes like a flame of fire; 15 His feet were like fine brass, as if refined in a furnace, and His voice as the sound of many waters;
16 He had in His right hand seven stars, out of His mouth went a sharp two-edged sword, and His countenance was like the sun shining in its strength.
17 And when I saw Him, I fell at His feet as dead. But He laid His right hand on me, saying to me,[h] “Do not be afraid; I am the First and the Last.
18 I am He who lives, and was dead (still Jesus), and behold, I am alive forevermore.
Revelation of Jesus Christ 22:
And, behold, I come quickly; and my reward is with me, to give every man according as his work shall be.
13 I am Alpha and Omega, the beginning and the end, the first and the last.
14 Blessed are they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city.
15 For without are dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and whosoever loveth and maketh a lie.
16 I Jesus have sent mine angel to testify unto you these things in the churches. I am the root and the offspring of David, and the bright and morning star.
*JW's your own comments and opinions are most welcome of course, but please refrain from simply copy/paste bombing this thread with your organisations dogma propaganda, thank you