Place Staff Account Created By field into a report?

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I have created a Staff Account Latency report that we use to monitor our Staff Accounts to ensure that we do not have users who rarely if ever log into the Support Console counting against our user licenses. We generate this report periodically, and then disable (not permanently) users who may not have logged into the Support Console in for several months.

I would like to add a field to this report to display the user who first created and possibly last updated the Staff Account. I am able to find this data in the Audit Log while viewing a Staff Account record. However, I am not finding the table where this information is stored.