It is very much a case of defamation.
1. You can file a case against him for defaming you.
2. Take a copy of his website. Print all the Whois info to prove his ownership of the website. You can go to (removed) to get the info.
3. Print each copies of the article where he wrote something wrong about you.
4. Collect as much evidence as you can.
5. You will have to prove, how his defamatory statements hurt your income and your current work.
6. Publicly post or publicly display in any manner an individual’s SSN. Publicly post or publicly display means to intentionally communicate or otherwise make available to the general public is illegal under law.
There are many defence too for defamation one big one is Freedom of speech.
All the best
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:) For whatever good we give out completes the circle and comes back to us.