ER
Everett M. Rogers
Everett M. "Ev" Rogers was an American communication theorist and sociologist, who originated the diffusion of innovations theory and introduced the term early adopter. He was distinguished professor emeritus in the department of communication and journalism at the University of New Mexico.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books
Silicon Valley Fever
1984
ISBN 9780465078226