The coach can't help himself. He can be emotional. Impulsive. Petty. "He’s always gonna be feisty," says left tackle Jordan Mailata.

The coach is off to the best start in team history — and yet his job was seen as in jeopardy a few months ago. We spoke to an expert to help us understand.

Nick Sirianni is the first coach in Philadelphia Eagles' history to take the team to the Super Bowl twice. He's already in elite company among peers reaching the season's final game again, something only Mike Tomlin and Joe Gibbs can claim in their first four seasons as head coach.