Question: Michael W. Punke, is an American writer, novelist, professor, policy analyst, policy consultant, attorney, and former Deputy United States Trade Representative and US Ambassador to the World Trade Organization in Geneva, Switzerland, he is best known for writing "The Revenant: A Novel of Revenge" (2002), which was adapted into film as "The Revenant" (2015), and starring which   American actor, film producer, and environmental activist, he began his career by appearing in television commercials in the late 1980s, after which he had recurring roles in various television series such as the soap opera "Santa Barbara"?
Answer: Leonardo DiCaprio