ASHA is the acronym for the American Speech, Language and Hearing Association. It is the governing body and professional, credentialing association for speech-language pathologists in the United States.
A speech-language pathologist certified by ASHA in clinical competence (CCC) means that a minimum of a Master's degree in the field of communication has to be obtained.
The speech-language pathologist is uniquely trained and qualified to work with accents, articulation, language, phonology, speech, voice, and all aspects of communication and language development, however, like the physicians, most speech-pathologists choose to specialize in one particular area.
When choosing a speech-language pathologist for your accent training, make sure he/she has extensive experience in accent training/modification, also he/she has fluent second language command so he/she has first-hand experience on the method, not just assumptive clinical theories.