Not necessarily. While someone who works compulsively—sometimes called a “workaholic”—may give the appearance of higher productivity, most evidence suggests that it is an illusion. In the long run, those who never stop working tend to work less efficiently and struggle to maintain focus. They also have a significantly higher risk of depression and anxiety, which will likely in turn harm their productivity. '
To learn more about how mental illness negatively affects productivity, see Mental Health and Productivity.