Good question.  While the good professor was not one to be here everyday he was here fairly often.  His profile says he posted 4 times in January of this year and then has not posted any more.  I can't see when the last time he actually signed on was. 

Hopefully just busy with teaching and other activities.

He Is In Control, Have a Great Day,  Brent

ok
going to take guess here
Dr. Crisi is in Brazil....world cup next month and lotsa work down there for it
and they had part of a stadium collapse
might be a bit busy
I hope just busy and too much work, a very good man
hope this helps
sincerely,
Kent