From Jayski.com:

Zippy has an out if Stewart leaves, but may not: #20 crew chief, Greg Zipadelli insists he doesn't know what Tony Stewart will decide about his future, which, according to his contract, should include at least another year at JGR. But Zipadelli believes a decision is all but made and sounds like a man resigned to a split. "I truly have tried not to get wrapped up in that, questioning about the unknown in my mind,'' he said. "When that comes, I'll worry about that. Right now, I need to worry about me, my guys, my family and this race team and being in the top 12 in points.'' Should Stewart leave, Zipadelli could go with him and extend the longest crew chief-driver reign in Cup. The long-term extension he signed with JGR last season has outs in it if Stewart is not with the organization. But Zipadelli doesn't sound like a man seeking to start over as Stewart would be doing to some degree if he joined a fledgling race team such as Haas. He is happy at JGR and enjoys the security the company offers him and his family, which expanded by one this past Wednesday with the birth of his second son and third child.(ESPN.com)(6-18-2008)