The (most) injured track worker was Rob Dages. Yes, he lived. The relevant parts of the story are (lifted from his account and news):
Rob was seriously injured on Saturday, July 7, 2001, when he was struck by a rider in Turn 2 at (New Hampshire International Speedway) Loudon, while clearing the track of a previous incident. Rob's actual injuries are: fractured pelvis and tailbone, bruised ribs (one broken), an impressively ugly gash in the left forearm, an equally scary gash in the head, and lots of bumps and bruises. The other track worker Rick Martin suffered only bruises and scrapes. The rider who hit the two, Rick Currier suffered similar non-fatal injuries.
And apologies to CC for fcuking up your squared away board, I've been away a while and don't tend to read the stickies.