Sibling rivalry isn’t always a bad thing. Porky Hefer, whose given name is Willem but acquired his porcine nickname as a child, courtesy of his older brother, has made the most out of it. That may be due in part to promotional skills honed during his former life working for such advertising agencies as Ogilvy & Mather. When he left to open his own socially conscious agency in Cape Town, he aptly named it Animal Farm.