Thanks! Another thought I had was to countersue with equally as damning comments. If there's going to be a public document with really bad allegations against me out there, then there should be an equally bad (yet more true) public document with allegations against the company and founder.
Additionally, if you're willing to go to the dark side...
If he's independently wealthy he probably has a lot more to lose than you do. You can use this as leverage. If you can get him in a position where he may lose a lot then you can probably get him to back off and drop the lawsuit.
So be willing and prepared to fight dirty (but still get a lawyer). He's bullying you, and against bullies it's often a good strategy to escalate beyond the comfort zone of the bully. He can afford to sue you because he doesn't feel vulnerable; losing the lawsuit isn't the end of the world to him. This is what you must change. Find a way towards mutually assured destruction.
If he's just a bully he's very likely to back off if you put up a fight.
I wouldn't consider counter-suing in this case to be the dark side. In fact, it may be the best way to get legal representation with little out-of-pocket spend, since the lawyer could work off a percentage of the potential damages.
I would suggest to not do anything that would make yourself look worse in the end. I would avoid saying things negative that he will then turn around and try and sue you (again!) for, such as leaving damning comments in the counter-suit.
However there is nothing wrong with counter-sue(ing) for the cost of your lawyer and the cost of the trial. Find a good lawyer and defend yourself.
