Who is Mike Ornstein, and who does he work for?

Where and when did this Ornstein email surface, if it actually exists? If the NFL had it why wasn't it presented as evidence in any of the various court and league trials of the case. Remember, not one player was suspended or punished in the end. The whole thing was dropped due to lack of evidence. Sean did not have a union to represent him and did not pursue a legal remedy, he and the team were the only ones that suffered, all the players were restored. The whole thing was a ruse - 50,000 pages of evidence claimed but scribbling on one napkin presented. Yeah, right.