There are quite a few well-known consulting firms, so we looked up the most popular by online search volume. An image consultant is someone who helps their clients develop and project their desired image through a combination of clothing, grooming, and behavior coaching. How much do consultants make? Boston Consulting Group BCG is another member of the MBB trio and is most famous for its thought leadership on business growth and its innovative approach to business strategy. PricewaterhouseCoopers PwC is another Big 4 accounting firm that has taken the consulting world by storm. After logging in you can close it and return to this page. Business Consultant 13 salaries.