Professor Keller is acknowledged as an international leader in the study of brands, branding, and strategic brand management. Actively involved with industry, he has served as brand confidant to marketers for some of the world's most successful brands. He has had multiple engagements with the following firms:

• Accenture
• Allstate
• American Express
• Blue Cross Blue Shield
• Campbell Soup
• Capital One
• Coca-Cola
• Colgate
• Disney
• Eli Lilly
• ExxonMobil
• Ford
• General Mills
• GfK
• Goodyear
• Google
• Hasbro
• Intel
• Intuit
• Irving Oil
• Johnson & Johnson
• Kodak
• Levi Strauss
• L.L. Bean
• Mayo Clinic
• McNeil Labs
• MTV
• Nivea
• Nordstrom
• Ocean Spray
• Procter & Gamble
• Red Hat
• SAB Miller
• Samsung
• Shell Oil
• Starbucks
• Tokyu
• Unilever
• Young & Rubicam