[2] Her maternal grandfather, the banker Baron Mór Lipót Herzog (1869 – 1934), numbered among Europe's leading art and antiquities collectors.
That same year, the Nierenbergs established Dansk in the garage of their Great Neck, New York, home, with Quistgaard as its founding designer.
She met Theodore David Nierenberg (1923 – 2009), the owner of a metal finishing company, at the Broadway premiere of Guys and Dolls in 1950.
In 1995 Nierenberg commenced a decades-long Holocaust art restitution battle with the Republic of Hungary that would count as one of the highest-value cases ever pursued by a single family.
Among the 44 paintings Hungary has refused to return are four works by El Greco, and others by Zurbarán, Velázquez, Corot, Courbet, and Lucas Cranach the Elder.