David Aaker is a prominent American marketing expert, known for his work in brand management and strategy. He is a professor emeritus at the University of California, Berkeley and has authored several influential books on branding, including "Building Strong Brands" and "Brand Leadership." His theories have shaped how businesses approach brand equity and identity. Aaker is also the co-founder of Aaker On Branding, a consulting firm that helps organizations develop effective branding strategies. His contributions to the field have made him a respected figure in marketing, influencing both academic research and practical applications in the industry.