I'm not aware of any way of doing this with default functionality if you allow users to set a resolution via the dropdown. The simplest way we've found is to create a "User Picker" custom field called "Resolver" (for example.) Install the Jira Misc Custom Fields App. It's not free, but it has a bunch of cool features. In the workflow transition that you set the Resolution field in, add a "Update Issue Custom Field" post function to populate the Resolver field with %%CURRENT_USER%% and you can use normal JQL to gather the information. If you allow issues to be reopened or unresolved, you need to be sure to clear the field, along with the Resolution field as well.
@Jack Graves [AC] first caught our eye with his incredible breakdown of what, in his opinion, can make or break a Jira software implementation. (Read his thoughts on this thread)! In this follow...
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