Van Boxtel semi-retired from national politics and became active in the private sector and public sector and occupied numerous seats as a corporate director and nonprofit director on several boards of directors and supervisory boards (AkzoNobel, Humanist Association and the International Union for Conservation of Nature). In May 2003 Van Boxtel was named as chief executive officer (CEO) of insurance company Menzis and in August 2004 he was also named as chairman of the board of directors. Van Boxtel also worked as a trade association executive for the Zorgverzekeraars Nederland (ZN) serving as Vice Chairman of the executive board from 20 January 2014 until 30 May 2015 and the Industry and Employers confederation (VNO-NCW) and as a media administrator for the public broadcasterDutch Program Foundation (NPS) serving as chairman of the supervisory board from 1 January 2004 until 1 August 2008 and as a sport administrator for Professional footballclubAFC Ajax serving as Technical director from 1 November 2011 until 30 January 2012. Van Boxtel was elected as a Member of the Senate after the Senate election of 2011 and was selected as Parliamentary leader of the Democrats 66 in the Senate, taking office on 7 June 2011. In September 2014 Van Boxtel announced his retirement from national politics and that he wouldn't stand for the Senate election of 2015 and continued to serve until the end of the parliamentary term on 9 June 2015.
