Ban joined St Francis' Prayer Group in Melbourne CBD in 1984 as it was close to his place of work. He became the leader of that prayer group from 1992 to 1997 and then as a prayer group leader for 2 more years in St Augustine's. Later, he attended the Sacre Coeur Prayer Community meetings after moving to Malvern East. In 2004 he became a member of its Pastoral Team. In July 2011, he attended the LTC Townsville to refresh on what he has learnt in the past.  When in Singapore he graduated with a BEng and ME; and then obtained an MAdmin in business from Monash University.