Ita helped with CSS elements (I wouldn't have known how to make buttons light up otherwise). Ita's website was a serious inspiration for designing this one, please give it a look!
One of the pieces in my TouchDesigner visuals reel was a direct recreation of one of his pieces. Nat is a fantastic graphic designer and artist!
Mark and I worked together on the Segaworld piece seen in my portfolio. I handled the background design and 3D elements, and he illustrated the beautiful Segaworld-style Sonic as the centre piece.
Mark is an excellent artist, and has created several official pieces for the Sonic the Hedgehog, Super Monkey Ball, and Puyo Puyo brands under SEGA.