From Wikipedia:

Frederick Irving Herzberg (April 18, 1923 – January 19, 2000[1]) was an American psychologist who became one of the most influential names in business management.[2][3] He is most famous for introducing job enrichment and the Motivator-Hygiene theory. His 1968 publication “One More Time, How Do You Motivate Employees?” had sold 1.2 million reprints by 1987 and was the most requested article from the Harvard Business Review.[4]:109–120