James Miller is the new chair of the Financial Markets Authority. (Image: Supplied)New Financial Markets Authority chair James Miller will step down from the boards of Vista Group and Ryman Healthcare, days after his appointment sparked debate about potential conflicts of interest arising from his ties to listed companies. Both NZX-listed companies announced on Tuesday that Miller would leave their boards following his appointment to lead the market regulator. Miller took up the role on Aug 6 for a five-year term, succeeding former Financial Markets Authority (FMA) chair Craig Stobo. The departures come as som...