Occupational health psychology (OHP) is a term first coined by Jonathan Raymond in 1990, yet OHP has historical, international roots dating at least to the early decades of the twentieth century. It involves research and practice to create healthy workplaces. This article has 4 sections. The 1st section discusses psychology's long history of concern for occupational health in industrial organizations, beginning with Hugo Münsterberg's study of industrial accidents and human safety in the late 1800s. The 2nd section focuses on OHP's movement from the convergence of public health and preventive medicine with health and clinical psychology in an industrial/organizational context. The 3rd section addresses the central issues of organizational and individual health through the framework of preventive management. The article concludes with OHP case examples drawn from the Chaparral Steel Company, the U.S. Air Force, and Johnson & Johnson.