The individual mentioned in the tweet below is a disgraced cyber-stalker. If he gets in contact with you to do his malicious criminal harassment for him, once you are aware of his activities, if you do so then you are committing a criminal offence yourself.
You may wish to learn more about Derry. Forewarned is forearmed
Fully referenced and independently verifiable details of Derry's obsessively insane criminal harassment behaviour can be found HERE
Nut job #Cyberstalker harassment of UK academics will not work. We have your measure. You are as easy to deal with as any other maliciously jealous and bitter poison pen letter writer: https://t.co/GneDH7aD9Q pic.twitter.com/hUnhzLt8Qx— Dr Mike Sutton (@Criminotweet) July 5, 2020