Well, Halo 4 is out now, so I can post stuff. This isn't all of it, but it's stuff I liked. I'll post some more in a bit. I had a lot of fun on the project, and I hope you enjoy my very rigid orthos.
Also, I was lucky enough to be featured on Kotaku: http://kotaku.com/5959657/its-like-a-reference-book-only-for-halos-spartans?post=54199621
Some armor that I worked on lone wolf style for MP:
A few props. The terminals in Halo 3 were what really cemented my love with the Halo Lore, so I was really excited to design it. I also love shooting fusion coils, so that was also fun.
These are power cores and damage states for when you BLOW THEM UUUUUPPPP
Some character work. Lasky's face is different in game because they scanned the actor, but I did design that guy's hair too. Robo Gabo designed the base uniforms for the officers/marines, these are variants by me.
Scientists. When submitted for approval, Frank O'Connor said he needed a haircut.
Spartan Armor turnarounds. Robo Gabo did sketches for the front view, which we then tweaked and added side and back views to to fully flesh out the armors. It was an honor.
Random stuff. The gun wrack was my first assignment there.