We've all got favorite Bible teachers, both living and dead. I listen to John MacArthur, Alistair Begg, & Phil Johnson, among others. I read books by James White, Jerry Bridges, John MacArthur, and so on, and so forth.
But do the people who hold to a certain doctrine prove that doctrine? Of course not, the Bible must be our ultimate authority in all matters of faith and practice.
Terry Rayburn wrote a great piece on this topic a while back, I link to it now for our edification.