An advertising agency or ad agency is a service business dedicated to creating, planning and handling advertising (and sometimes other forms of promotion) for its clients
"It's a news source for media and businesses, mostly. It talks about the latest news and trends in the advertising world and businesses. Think of it as the CNN for the advertising world."
Now in the computer age most companies have a website where they will put a company history available. If you cannot find this you can always call the company and just ask when they started. Most...