For you were going astray like sheep; but are now returned to the Shepherd and Overseer{"Overseer" is from the Greek episkopon, which can mean overseer, curator, guardian, or superintendent.} of your souls.
Peter evidently addressed servants but not masters because he addressed a social situation in which some of his readers were household servants but few, if any, were masters. [Note: Michaels, p. 122.] 