Adler refers to Alfred Adler, an Austrian psychiatrist and founder of individual psychology. He emphasized the importance of social interest and community in human development, proposing that feelings of inferiority drive individuals to strive for superiority and personal growth. Adler's theories focus on the holistic view of the person, considering both their inner feelings and social context. Adler's work laid the foundation for various therapeutic approaches and influenced many fields, including education and counseling. His concepts of lifestyle, birth order, and the importance of early childhood experiences continue to be relevant in psychology today, impacting how we understand human behavior and relationships.