Former Flight Attendant Takes on Coinbase in Debut at High Court

Hassan Zavareei started out as a Russian language flight attendant for Delta Air Lines Inc. On Tuesday, he’ll speak before another captive audience, this time on the ground as an attorney arguing a case against Coinbase Inc. at the US Supreme Court.

Zavareei will make his Supreme Court debut in a case against the online cryptocurrency exchange, which is asking the justices to halt two proposed account-holder class actions while it fights on appeal to send the dispute to arbitration.

The 54-year-old co-founder of a class action and whistleblower law firm, who will argue for the cases to proceed, considers ...