George Mason influenced the creation of the Bill of Rights primarily through his refusal to sign the United States Constitution and his vocal opposition to it, which highlighted the need for safeguards for individual liberties. More specifically, the best answer to your question is:
• He wrote a pamphlet titled "Objections to This Constitution of Government."
This pamphlet detailed his concerns about the lack of a Bill of Rights and emphasized the importance of protecting individual freedoms, ultimately contributing to the push for the inclusion of a Bill of Rights in the Constitution.