Michael Mann is the inventor of the fraudulent hockey stick, and is suing NRO based on another fraudulent claim.
Geir Lundestad, Director, Professor, or The Norwegian Nobel Institute emailed me back with the following:
1) Michael Mann has never been awarded the Nobel Peace Prize.
2) He did not receive any personal certificate. He has taken the diploma awarded in 2007 to the Intergovernmental Panel on Climate Change (and to Al Gore) and made his own text underneath this authentic-looking diploma.
3) The text underneath the diploma is entirely his own. We issued only the diploma to the IPCC as such. No individuals on the IPCC side received anything in 2007.
h/t to Marc Morano