My client Aidan Mitchell, who grew up in Ireland, booked a lead role in the film The Simple Things, using the American accent I taught him.
I'm working this week with Tommy "Tiny" Lester, teaching him an African accent and re-recording his role in the ADR studio on One Night with the King to better match the period setting.
Had a phone session dialect coaching actress Laura Dekkers into an Upper Class English accent (also called RP or Received Pronunciation) and a North Cumberland accent for the Broadway premiere of Andrew Lloyd Webber's new musical The Woman in White. Laura also had me record her dialogue in the respective dialects, so she could listen to them for reference (I emailed them to her as mp3 files and mailed her a backup cd.)