Casey is no longer with WMF, please deactivate his civicrm user.
In T226434#5281020, @Eileenmcnaughton wrote:
This was emotionally difficult but I went ahead and removed all his roles and blocked his user. @Eileenmcnaughton any thoughts on whether we should delete his user or keep it for historical records (as in any changes he might have made in Civi)?
@mepps I think we don't lose history - although I have a feeling we have a tonne of disabled users - implied we have favoured blocking over disabling