Trivia: While he enjoyed the finished film, star Bill Paxton admitted he wished "Twister" was a bit darker and edgier. For a while around 2010, he tried to get a sequel off the ground to deliver this more intense vision, and he was even interested in potentially directing the follow-up. Little is known about what the sequel would have been about, although Paxton hinted he wanted to utilize 3D filming techniques (which had been re-popularized by James Cameron's "Avatar") to really put the audience into the tornado chases. Unfortunately, the sequel never came together.
Trivia: According to the Special Effects documentary, the sound of the tornado was produced by recording a camel's moan and digitally slowing it down.
Answer: Based on his scenes, he seems to be a photographer for the team. He was taking pictures of Jo, showing how Dorothy worked, and was setting up a camera when Bill and Jo were going after the F5 at the end.