1 Simon Peter, a servant and an apostle of Jesus Christ, to them that have obtained like precious faith with us through the righteousness of God and our Saviour Jesus Christ:
The word “servant” here comes from the Greek word doulos. Doulos is probably more properly translated as bond-servant, in my own translations I generally prefer the word slave. (For a larger commentary on the usage of this word see my notes on Romans 1:1 here.) I bring this up because it is interesting to note that Peter first introduces himself as a slave/servant of Jesus Christ first and as his Apostle second. In other words, it is our relationship to Jesus Christ which defines us, the capacity in which we are called to serve him in is secondary.