White Claw’s owner: Hard seltzers could capture 30 percent of US beer USA | Disruption may be such an overused term. But it perfectly describes what hard seltzers did to the US beer market. At the Beverage Forum, organised by the Beverage Marketing Corporation and conducted online in early May 2021, Anthony van Mandl, 71, the owner of Mark Anthony Brands and maker of White Claw, explained which trends boosted the category.