Anybody looking to live in the US or work with English speakers. It doesn't matter what your profession is, you are going to benefit from having clearer pronunciation and sounding more American. While people and companies are starting to get more aware of unconscious bias, the matter of bias based on accent is not often addressed. You may be perfectly qualified for a job but may be overlooked due to your accent, even if you have impeccable grammar and an impressive vocabulary. Even if your goal isn't career advancement but just blending in with your American friends and community, this is for you.