You didn't say what state you're in, but I assume it's not Ohio.
You can submit (or agree) to the jurisdiction of Ohio, but if you think there's a valid reason that Ohio doesn't have jurisdiction over you (such as you don't live there, you don't own property there, etc.), you can contest it, and that might force him to take the case to YOUR state.
HIS living there is not sufficient for the court to have jurisdiction over you, without other factors.
But if you're going to contest jurisdiction, you have to do it at the beginning. You can't respond to the court and start participating in proceedings and THEN assert later that there is a jurisdiction problem.
Talk to an attorney in your state first to see what he/she thinks.
Best of luck to you!