A person who produces work in the vernacular is one does what?

A person who produces work in the vernacular is one who writes or speaks in the common, everyday language of a particular region or group of people. This writing or speaking style uses expressions and words that are familiar to the local population and may not be widely understood by those outside that particular area or group. Vernacular literature or speech aims to connect with common, ordinary and local audiences by mirroring their linguistic norms in writing (vernacular literature) or through spoken word (vernacular speech).