My NYU interviewer's English wasn't great; he was a professor I think they had begged to interview me coz they were short-staffed in the admissions office that day. As a general tip, if you are being interviewed by someone whose English is a bit (or very much) on the poor side, make it a point to say things like "I WANT TO HELP PEOPLE" or "I'M GOOD WITH MY HANDS" loudly and clearly. They might sound like trite and obvious phrases to throw into your conversation, but I can tell you from previous experience and personal knowledge (my father is an immigrant and used to interview candidates for jobs in a different field) that someone who struggles with English and is conducting interviews is specifically looking for you to say those things; you can talk eloquently around topics like helping people and volunteering and research all you want, but if you never actually say "I am interested in research", there's a good chance your interviewer won't write "said he was interested in research" in your evaluation. Good luck!
