Final answer:
Carl Rogers and Abraham Maslow are the two theorists who contributed the most to the human relations movement. They focused on the growth potential of healthy individuals and emphasized self-actualization, free will, and self-determination.
Step-by-step explanation:
The two theorists who contributed the most to the human relations movement are Carl Rogers and Abraham Maslow. Both of these psychologists were influential in shaping humanistic psychology and focused on the growth potential of healthy individuals. They emphasized the importance of self-actualization, free will, and self-determination. Their theories have greatly contributed to our understanding of the self and continue to be influential in the field of psychology.