one of my coworkers, who authored a lot of reports in Mixpanel, is leaving the company; is there a way to change the ownership of all his reports / dashbaord in bulk, so that they become mine?
If you are an Owner, you should be able to access the reports and/or assign yourself to the team that the other user was on. Also, if you go to the Project Home, and click Boards, you should see your teammate and all the boards they created.