I Googled the three readers and found the following:
Elizabeth Klett's writing in her personal page/blog suggests she is American or Canadian - she uses "mom" and one of her hobbies is quilting.
Moira Fogarty - interestingly, on her own profile page she writes "
My voice is full, deep, round, clear and well-inflected with no heavy accent. My diction and enunciation are as close to pristine BBC Newscaster English as you can get without a British accent" (my italics). She also describes herself as a native speaker of English (British), English (North American) and English (Other).
I couldn't find any biographical info on Sherry Crowther.
PS - Sorry about the usual formatting problem with the cut-and-paste bit.