Student found guilty of plagiarism is also academic at other university I am an administrator of a university in U.K.  A student has been found  guilty of plagiarism and is facing the harshest punishment – 0 in the  course and no opportunity  to retake which will get him out of the school.

However, he is also an academic at another university.  Do we need to inform the department  head at his university even though it is a completely separate entity from ours?  The course is different from what the student teaches at the other university.

I am concerned  about the data breach and confidentiality issues.   As academics do we have duty to report this?
This may be covered by privacy law in UK as it would be in US. You need to consult with a lawyer before you take any action that isn't already embodied in your policies, which I assume have already been vetted. 

If you are permitted to inform the other university you should also consider whether you are liable to civil action if you do so. But your lawyer will have advice about that as well.