A stock broker is anyone who facilitates client trades on an investment exchange. Often (usually) they do other things as well, such as investment advise, portfolio and wealth management, retirement counseling, asset management, etc. They can run the gamut from super-sketchy to highly-credentialed. Most of them serve existing clients, of varying wealth levels depending on where they work. Some, but only a small portion, do call-calling trying to drum up unsolicited business.
A brokers job -- and this applies to any broker -- is to get his clients to trade. They won't admit this (certainly not the high class brokers) but its universally true. Because they usually only make money when the client is buying or selling something. It doesn't matter whether the client makes money or loses money, nor whether they hold for 1 day or 1 decade. Brokers try to make clients trade, as frequently as possible.
That means making a lot of phone calls. Even the high class brokers are constantly "checking in" with their clients to mention new investment options or tips. And then there are the cold-callers, which are the lowest of the low. But really, they're all (mostly) scum of the earth and do not have your best interests at heart.
From what you said, there's not enough information to say what kind of clients he works with. He could be cold-calling, or he could be servicing the existing clients of a more senior broker. But either way, he's a blood-sucking faggot. You can tell him I said so.
