Leo$$s Cleaners embarked on a plan to make its dry$-$cleaning staff happy with their jobs in the summer. Leo felt this was the perfect time to institute the plan because the high day$-$time temperatures added to the high temperatures in the cleaners from pressing machines, irons, driers, and other heat$-$producing equipment made working there unpleasant at times. Leo brought in portable air conditioning units, stocked a freezer with ice and cold treats, and stocked a refrigerator with cold drinks. He gave employees a five$-$minute break every hour so they could get a drink and stand in front of the air conditioner if they wanted to$.$

At the beginning of the summer, he had three employees who reported they were satisfied with the work environment as it was; the remaining ten employees were dissatisfied. By the end of the summer, he found that there were four employees who reported they were now satisfied with the work environment, two employees were dissatisfied, and the remaining seven were not dissatisfied. He was puzzled by these results because he thought employees should be satisfied or dissatisfied and asked you for input. You explained that he has stumbled upon the same results as a famous motivational researcher. Which of the following researchers proposed a theory of motivation based on satisfaction and dissatisfaction?

Herzberg

Maslow

Hawthorne

McGregor

Ouchi