hide identity of the technician

Here we have an old problem: in our current help-desk, a user can see who has solved an ticket. And as soon as the users have a new problem, they ignore the ticket creation and just make a phone call directly to that technician, because they realize "who is the one that solves problems".

I would like the name of the technician not to appear in the follow-ups and ticket information for self-service users.