I'm not really convinced that StackExchange is the best system for that. You'd really want one StackExchange per person; otherwise, the one-answer-per-question nature of StackExchange, with voting for "correct" results, which result in bizarre gaming behavior and impossible-to-follow discussions.
You could use the tag system.
The questions would be at ama.stackexchange.com/questions/tagged/Joel+Spolsky. The person who posted the question just had to accept the answer of the person who he had asked.
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A dedicated ama.stackexchange.com could be an interesting experiment.
I'm not really convinced that StackExchange is the best system for that. You'd really want one StackExchange per person; otherwise, the one-answer-per-question nature of StackExchange, with voting for "correct" results, which result in bizarre gaming behavior and impossible-to-follow discussions.
You could use the tag system. The questions would be at ama.stackexchange.com/questions/tagged/Joel+Spolsky. The person who posted the question just had to accept the answer of the person who he had asked.
The native use of reddit is to be able to do an IAmA. Why would you even want anything else for that?