Mary,
I highly recommend Paul Meier:
https://www.paulmeier.com. I have used him to work with my high schoolers on many English-speaking shows and other dialects. He is talented, professional, creates his own dialect books, and offers coaching in affordable price ranges. We would often purchase his dialect books, work for a few weeks together as an Ensemble learning the dialects, then Paul would have Skype coaching session with the students individually to help polish the sound. He works technically, specifically, but also with a sense of character and theatricality. Go check out his website!
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Jennifer Jordan
Director of Theater and Dance
Miss Hall's School
Pittsfield MA
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Original Message:
Sent: 08-17-2018 11:49
From: Mary Todd Kaercher
Subject: Dialect teaching ideas for Mary Poppins Jr.
I would love some ideas for how to get middle schoolers British accents. Our show auditions in December before their 2 week break and it would be lovely to have some things for them to work on. Thanks!
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Mary Todd Kaercher