Tharisa Plc announced that Joanna Ka Ki Cheng has been appointed to the board as alternate non-executive director to Brian Chi Ming Cheng with effect from 25 September 2015. Cheng is a chartered accountant and a member of the institute of chartered accountants of Ontario, Canada. She has more than 15 years' experience in business development, investment and management and is the General Manager (Energy) of NWS Infrastructure Management Limited.