About Us America’s a nation devoted to life, liberty and the pursuit of happiness. If you long to experience the American dream— or want to help someone else experience it— Harker Law Office is the Tulsa, Oklahoma law firm to call. John W. Harker can help you with: Pursuing citizenship and naturalization Obtaining or renewing a green card Resolving a family-based immigration issue Defending a deportation or criminal case Hiring and retaining international employees Want to learn more about Tulsa, Oklahoma immigration law? Contact John W. Harker of Harker Law Office today by calling 918-877-2615.