He's been involved in plenty of controversy.
http://jfk.hood.edu/Collection/Weisberg%20Subject%20Index%20Files/H%20Disk/Hickey%20George%20W/Item%2001.pdf
Also been involved in many other 'conspiracy theories'.
https://www.nbcnews.com/politics/trump-impeachment-inquiry/whistleblowers-welcome-mark-zaid-represents-trump-accuser-others-secrets-share-n1071811