In our case, the person who creates the person or organization may not be the same as the current owner. I noticed that while there is a "deal creator" field I can filter on, there is no "person creator/created by" and "organization creator/created by" - the only thing available for those objects is the created date timestamp.
1. Friendly request to add those missing fields for organization and person.
2. Also, as you're working on LEADS - please also consider a field "lead creator/created by" and if the person/organization is created by lead conversion, the person who converts the lead should be the creator of the person/organization.