Better late than never ...?

One of my regular gigs is mentoring a new (I mean in first could of years in the role) director of  PK - 12 independent school. Some of our sessions are on practical things like calendars, recruitment and newsletters. Some are more philosophical, or as I like to ask, "Who are we and why are we here?". This week he asked what to do about a highly-effective teacher who is frequently late of a morning.