Street art is nothing new, and neither are the art dealers and banker douchebags who try to cash in on "the next big thing". But what the high art world often fails to realize is that the core of street art is the public display of the work and the interaction with the world—it has little to do with screenprints on gallery walls. This is also probably why it continues to remain a valid art form no matter how many Banksy paintings Brad Pitt buys.

One guy who does get this world is Sebastian Buck, the founder/curator/writer of If it's happening on the street and if it's any good, this guy is on it. To get a legit read on what's going on in the global street art scene right now, we tapped Sebastian for his opinion on the 50 greatest street artists working right now. Click on the gallery above to check out his countdown.