I know, because I had to change my screen name-under my previous account-because of persistent harassment by this odious fellow.
He earned a prominent-but decidedly unfavorable-mention on my previous profile page.
Funny, I almost forgot about 'my professor'. A local nutjob started spamming me, but I was able to stop that just by blocking his email. I think, but I don't know because I didn't take the time to find out, that I got a virus from him. Coincidentally, one of his fellow professors (who agreed with me) and the college got a virus at the same time. I also copied some of his rants to me to everyone who was on the original blast email along with my own witty retort. ;-)
Finally, after 4 screen name changes, he gave up.
What is it with these professors?