1. He is retired and working for free, so he can't be fired, but he can stop working, and that's what he's doing.

2. We know. Previous articles on this gave his background, they are linked below this one, anyone interested enough to comment might have bothered reading them, and others out there, to get the full picture. One quote:

"He is a Fellow of the Royal Society of Canada, the author of eight books on the Holocaust, including The Holocaust in History, Lessons of the Holocaust and co-author of Vichy France and the Jews, and a former dean of the University of Toronto's school of graduate studies.

...

"His scholarship would indicate someone who has fought his entire life for human rights. Younger Junior Fellows may not be familiar with it; it is reasonable to react how they did," he (Segal) said.​