<page_title> List of United States Supreme Court Justices by time in office </page_title> <section_title> Justices by time in office </section_title> <table> <cell> 7 <col_header> Rank </col_header> </cell> <cell> William J. Brennan Jr. <col_header> Justice </col_header> </cell> </table>
William J. Brennan Jr., is the seventh longest serving justice in the Supreme Court.