<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.bw joseph alichukua wadhifa huo kutoka kwa nicholas nganga ambaye amekuwa uongozini tangu 2007, akiwa amehudumu kwa miaka 13.  <response>: this comes after the expiry of nicholas nganga who had served as the chairman for 13 years since 2007. 