Prevent Requestor seeing Assigned To

Prevent Requestor seeing Assigned To

Hi
We have a business requirement that the customer that submits a request (as the requestor) should not be able to see the Assigned To Technician. They can see the Group, but not the Technician. Is it possible to not show the Assigned To Technician in the list of columns available in the View list? I understand that it is possible to prevent the Requestor viewing the field when they submit or edit the Request, but they are still able to add the 'Assigned To' column to the View list.
 
An additional request is that they do not see any Updates of the Technician in the History tab of the Request. Is this possible also?
 
Thanks

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