You can find this in a few places, depending on how your community is "built." One of the universal ways to do this is in Admin -> Mod Tools -> Audit Logs. You can also break it out in CHA, aided with Filters. CHA -> Content -> Forums -> Members (tab) Then sort on Solutions Authored and Solutions Accepted. It might not be easy to put it together, but could prove to be a start. There's also some options in the Advanced Metrics tab in Admin, but I'm having a hard time getting the "Solved by the Question's Author" option to break down by username. I don't know that I've ever seen that data. Hopefully someone else has a hack to share. Since you're suspecting an individual, then this might help (in advanced):
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