I wanted to give Callum a forum shout out as well. I race with him in the S5/S3 SKUSA class and he is not only a top notch driver but also has some top top notch sportsmanship off the race track.
Here is a short race video I got of him from this past weekends SKUSA event at Sonoma. You can see him making a good defensive move early on in the race (he is Kart #442) https://www.youtube.com/watch?v=J-t87newbFo
Porsche Driving Instructor, Sim-Racing Expert, Shifter Kart Novice and a Former Marine