The surprising impact of word of mouth marketing in a digital age

Mark Schaefer
6 min readAug 28, 2023

Ed Keller is one of my marketing heroes. He’s considered the godfather and preeminent authority on word-of-mouth marketing and he wrote the seminal book on the subject in 2003, The Influentials. Ed is still researching the subject today as a professor at the University of Pennsylvania.

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Mark Schaefer

Keynote speaker, marketing strategy consultant, Rutgers U faculty and author of 10 books including KNOWN, Marketing Rebellion, and Belonging to the Brand!