This is HiGPS (Heavy is General Problem Solver). He plays in Norway and mains sniper, and a very good one at that. He currently streams videos of him playing in UGC Highlander Silver division and also has an episodic series featuring weapons in TF2 and how to properly use them.
Here is an example of his latest episode showing off replays of other players whom they sent to him to discuss the pros and cons of using certain weapons in TF2 and how to properly play a class. Keep in mind that the replays were sent to him and he uses them for discussion purposes only.
For more info on his streaming schedule or to check out more videos of him, you can check out his twitch.tv page or youtube page. He also has a twitter page.
Enjoy!