Berkery's specialty is coaching American actors in making the transition from American English to British English, most famously
Renée Zellweger for the Bridget Jones films where she spent five weeks of full-time intensive coaching with Zellweger. Her other American students have included
Gwyneth Paltrow for
Shakespeare in Love (1998) and
Johnny Depp for
Finding Neverland (2004), etc.