Witan announced that Ben Rogoff is joining the board of the company to help the global investment trust run by Andrew Bell cope with the challenges of the internet revolution. Rogoff, manager of the Polar Capital Technology (PCT) investment trust, will become a non-executive director of Witan in October. He will assist the board and Bell in judging how the sweeping changes wrought by smart phones and the shift to cloud computing will affect the £1.5 billion portfolio.