A person for whom I was a power of attorney for the past 14 years has died. What method of determining a reasonable fee for my services is appropriate in the state of Ohio? I performed many business transactions for him and provided all transportation for the past 14 years. I was never compensated for my services.

Since the person has died you might not be entitled to any fees. This is something that should have been discussed and arranged before death. I don't want to sound rude but why after 14 years is this question coming up?

Power of atttorney normally don't get any fees, it is normally a family member or friend who merely signs on their behalf.

Providing transportation is not part of a POA duties, but that of a care giver.

Since you did it for 14 years it is obvious you did not bill or charge for this service so no payment would be due.

Note you could not even collect on old debts since the SOL would have ran out on most of the years of service.

So it appears for 14 years you were happy to do this for free, but now want something, the person should have or needed to list you in the will if you wanted something after his death.

POA also ends at his death, so at the time of his death your legal right to POA ended.