The Jira Enhancer plugin will probably give you what you need.
Create 2 custom fields
Create a filter "resolutiondate <= 30d".
Use the "Two Dimensional Filter" or "Issue Statistics" gadget on a dashboard and put the "Last Resolution User" a one of the parameters into the gadget config. Choose the filter to limit the list of issues.
This of course won't cover the use case of an issue being resolved multiple times in the last 30 days by different users. It'll just show the last user to resolve.
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