Greco, who will start officially Aug. 16, has 30 years of marketing and association experience.
Most recently, he spent a year running Greco Enterprises, a family holding company. Before that, he headed the Yellow Pages Integrated Media Association for three years. He has also held senior marketing positions at AT&T Corp. and R.R. Donnelley & Sons Co.
"As a former marketer and technologist, John has an excellent understanding of the key issues facing our business, both on the business-to-consumer and business-to-business sides; has had considerable involvement with association and nonprofit management; and will provide the DMA the direction and vision needed to adapt to a rapidly evolving marketplace," Wientzen said in a statement.
Wientzen, who announced his retirement in December, has spent more than seven years at the helm of the DMA. SpencerStuart conducted the search for his successor.