[entertainment] An impressionist or a mimic is a performer whose act consists of imitating the voice and mannerisms of others. The word usually refers to a professional comedian/entertainer who specializes in such performances and has developed a wide repertoire of impressions, including adding to them, often to keep pace with current event... Found on http://en.wikipedia.org/wiki/Impressionist_(entertainment)
Im·pres'sion·ist noun [ French impressionniste .] (Fine Arts) One who adheres to the theory or method of impressionism, so called. Found on http://www.encyclo.co.uk/webster/I/24
a person who follows or adheres to the theories, methods, and practices of impressionism, esp. in the fields of painting, music, or literature. · an entertainer who does impressions. Found on https://www.infoplease.com/dictionary/impressionist