Ann-Marie Campbell

Home Depot continues to outperform—and so does Campbell, now driving about one-third of revenues at the $83.2 billion retailer, whose same-store sales rose 5.7% in 2015’s second quarter. The Jamaican-born onetime cashier spends most of her time in her region’s 700-odd stores, where she’s known as a prolific tweeter and champion of customer service.