(ShareCast News) - Porta Communications, an AIM listed communications and marketing group, announced changes to its board of directors on Thursday as chairman Bob Morton stepped down from his role.The company has appointed former group managing director Steffan Williams as chief executive. He will replace David Wright, who will take up the position of executive chairman.Previous chairman Bob Morton is stepping down due to health issues.Analyst Jamie constable at N+1 singer said: "Steffan has a very good CV to drive the group forward."Non-executive director John Foley has been appointed as senior independent director."The strength of the platform that we have built is allowing us to add to the quality of our senior team across all geographies. This accumulation of talent is allowing us to be considered for and to win ever more significant client assignments. Steffan's initial focus will be to ensure that this positive momentum continues to gather pace," said David Wright.The share price rose 8.8% to 3.4p at 0949 BST .