Famous Italian soccer referee Pierluigi Collina, now retired, was among speakers at yesterday’s ‘Greek Leadership Congress,’ organized by the Association of Chief Executive Officers (ACEO) at an Athens hotel yesterday. Other speakers included management gurus Tom Peters and Richard Boyatzis. Collina said good referees always had to think ahead and study teams and players before the game in order to know what to expect as much as possible. Peters said the best companies are those that do not believe in perfection but in continuous improvement and change. Boyatzis stressed the importance of emotional intelligence in management.