This is fieldworks in schaumburg.  It is a market research company that pays you money to come in for focus groups.  Not really a scam.

I received a call about a marketing company. I was tired. The phone operator sounded questionable. I have no idea if he was legit, or not, but he sounded inexperienced. He said something about pizza. His obvious lack of knowledge made me question the situation and turn it down. He seemed confused that I didn't know what he as talking about, in retrospect.

I would guess, as my land line is on the no-call list, that this was in response to something I signed up for. I play Lord of Ultima and Facebook games. Both offer options to complete offers for free points.

The name of the company is Fieldwork/Chicago, and they're legit. (I looked up their latest phone number here as I didn't recognize it and my office phone doesn't show the caller's name.) They specialize in focus groups and market research; once you sign up with them, they'll call you whenever your basic demographics fit whoever it is they're looking for, and if your answers to their phone interview fit their client's needs, you'll be invited downtown (or to one of their suburban offices) for a focus group or interview. You get paid for showing up on time, even if they're overbooked and you get bumped from the session.

I've been visiting them since the late 1980s. To the best of my knowledge, they don't recruit via cold calling; you actually need to sign up with them at their website, or via a friend who's already on their list. (I know, they didn't have websites in the late 1980s, and that's way too long ago for me to remember how they found me originally. :-)

How is this company able to call cell phones which are on the do not call list?

This number is from Fieldworks, a market research company in Schaumburg.

agree, they are good... nice way to earn money

This call is from Fieldworks Chicago, they do surveys that they pay you for if you qualify, I have qualified a few times and the money isn't bad

They called me as well but didn't leave a message.

Same here, didn't answer and they did not leave a message.

no message left