Business runs through Dionne Mahaffey’s veins. Her father was an entrepreneur as she grew up in Birmingham, Alabama. So, it was almost inevitable that Mahaffey, a business psychologist and self-described “techie,” would develop WhereU. It’s in her DNA. Mahaffey’s app works as a search engine and GPS-driven directory. Its “near me” function helps users find black-owned businesses in dozens of U.S. cities. Consumers can search among 17 categories of African-American-owned companies, including business services, arts and entertainment, health care, real estate and automotive.