Final answer:
Dr. Lipka is most likely an industrial-organizational psychologist, with a specific focus on organizational psychology, which measures employee job satisfaction and aims to enhance productivity.
Step-by-step explanation:
Dr. Lipka, who is involved in the study of employee job satisfaction and productivity, is most likely an industrial-organizational psychologist. This branch of psychology is divided into industrial psychology, which focuses on the hiring and training of employees, and organizational psychology, which deals with employee relationships and organizational culture. Both these areas address job satisfaction, but it's organizational psychology that specifically measures this aspect within I-O psychology.
Industrial-organizational psychologists conduct research on job satisfaction, which is affected by various factors such as belief in having control over one's work, participation in decision-making processes, freedom from excessive oversight, and feeling integral to the outcome of work. They are also instrumental in designing performance appraisal systems that are fair and contribute to both organizational efficiency and employee morale. Therefore, in the context of the question, Dr. Lipka's research would be situated within the realm of organizational psychology, aiming to improve not only the individuals' job satisfaction but also their productivity as part of the organizational structure.