Occupational health psychology is concerned with improving the quality of work life and protecting and promoting the safety, health, and well-being of workers. Research and theoretical development in this area of psychology has focused on a number of core areas, particularly the study of workplace stress, health and safety at work, workplace aggression and bullying, work–life balance, and impact of the organization of work on health and well-being, including flexible work and new technology. Researchers have devoted attention to understanding the causes and mechanisms linking work design and organizational factors to health, safety, and well-being in the workplace, as well as developing interventions to improve work conditions and promote well-being. While much of this work has focused on alleviating negative effects (e.g., preventing disease and injury and reducing stress symptoms), positive psychology has influenced researchers to examine motivating effects that create the conditions for personal growth and learning (e.g., job crafting, thriving at work, and work engagement).