AIM-quoted creative audio-visual company MediaZest has appointed Andrew Last as its finance director with immediate effect.Last, who joined MediaZest in October 2014, will also be appointed as an executive director, the company confirmed on Thursday.Prior to MediaZest, Last worked in practice for a firm of Surrey-based Chartered Accountants and specialised in advising a portfolio of small and medium sized UK based businesses.MediaZest also said James Abdool, currently its group sales director, will step down from the board as of 31 August 2015. In the intervening period he will continue to work on current projects and clients.The company said it was exploring the possibility of Abdool continuing as a consultant beyond August. As a result of both of these changes, Geoff Robertson will remain chief executive and assume overall responsibility for the group sales effort.MediaZest's shares closed down 2.14% at 0.27p on Wednesday.