English is English. If you learn the correct terminology for business and finance and blunder on simple grammar or spelling then you will look ridiculous. A book from a library or bookshop will serve to learn the terminology.

I think the teacher "Richard" teaches English related to business, you might want to contact him.

An English speaking professor who is good at business management. 

Business and financial stuff are kind of broad fields, so if you narrowed it down a bit you might get a more specific answer. I'm a US lawyer so I could help with the specific language of law, which is a type of business English, but I rather doubt that is what you're looking for.