Heider refers to Fritz Heider, an influential psychologist known for his work in social psychology. Heider is best known for his contributions to the understanding of how people perceive and interpret social interactions. His most notable theory is the attribution theory, which explains how individuals attribute causes to their own and others' behaviors. In addition to attribution theory, Heider developed the concept of balance theory, which explores how people strive for consistency in their attitudes and relationships. His work laid the foundation for further research in social perception and interpersonal relationships, influencing many areas of psychology and communication studies.