Lee A. Schneider, one of the foremost fintech law practitioners, has left McDermott Will & Emery to become general counsel of blockchain software developer Block.one, effective June 4.

Schneider will be responsible for all of the company’s legal, regulatory and compliance affairs, according to an announcement from the company on Tuesday. Block.one bills itself as the  world’s largest blockchain developer and the author of the EOSIO software. It is a Cayman company with offices globally, including Hong Kong and the United States.