Where are you filing your lawsuit? I have considered doing the same. His actual name is definitely Jeff Kaufman. I am in the process of trying to obtain additional information about him.
This goon is harassing uninvolved persons in chasing an alleged corporate debt. If you are pursuing legal action against him we would be interested in participating.
Contacted NYC BBB, they called him and he hung up on them. 2 hours later "Jeff" left voicemail that they are "dropping the case". Now NYPD pursuing criminal investigation.