He has worked in some quite diverse roles in some good and some questionable productions(Psi Factor comes to mind for the later).
He left Law and Order before they fired him(they had replaced him behind his back). He got really fired up with Janet Reno's attacks on violence on television, he considered it censorship and an affront to the Constitution. He felt NBC was gagging him because they refused to let him on their news shows to make his point. He quit and moved to Nova Scotia to start a life in self imposed exile.(Some say his alcoholism was the reason he was so vehement about this) I believe he applied for Canadian citizenship and it was recent.y granted. He lives in Vancouver now I believe.
The guy is a died in the wool right winger (really a libertarian). In fact he started a political party in Canada (The Realists) and says he will be their version of Reagan.
I have seen him in various show produced in Canada. In fact he just recently won an award (comparable to the Emmy) for a TV movie he appeared.
Some might consider his politics kinda whacko, see for yourself just search on his name at this site where he is a frequent contributor:
Enter Stage Right