Some exponents of Idealism are

Plato, Kant, Hegel

Dewey, William James, S, Kilpatrick

Rousseau, Comenius, Spencer

Aristotle, John Locke, John Friedrich

Herbart

The exponents of Idealism include:

1. Plato: Plato was an ancient Greek philosopher and one of the most influential idealists. He believed that the ultimate reality consists of abstract ideas or forms, which are more real and immutable than the physical world we perceive.

2. Immanuel Kant: Kant was a German philosopher who developed a philosophical system known as transcendental idealism. According to Kant, our knowledge is shaped by the interaction between our senses and the innate structures of our mind.

3. Georg Wilhelm Friedrich Hegel: Hegel was a German philosopher and one of the key figures in German idealism. He proposed a dialectical approach to understanding reality, known as Hegelian dialectics, which emphasizes the role of ideas and concepts in driving historical and social development.

4. John Dewey: Dewey was an American philosopher, psychologist, and educational reformer. He developed a philosophy known as pragmatism, which combines elements of idealism and empiricism. Dewey emphasized the importance of experience and practical action in the pursuit of knowledge and truth.

5. William James: James was an American philosopher and psychologist who was also associated with pragmatism. He believed that ideas and beliefs should be evaluated based on their practical consequences and how they impact human experience.

6. William Heard Kilpatrick: Kilpatrick was an American philosopher and educator who developed a philosophy of education known as the project method. He emphasized the importance of active engagement and problem-solving in the learning process.

7. Jean-Jacques Rousseau: Rousseau was a French philosopher and writer who advocated for a type of idealism known as naturalism. He believed that individuals are naturally good but are corrupted by society, and suggested that education should be based on natural development and individual freedom.

8. John Amos Comenius: Comenius was a Moravian philosopher, theologian, and educator who is often referred to as the father of modern education. He emphasized the importance of using sensory experiences and visual aids in teaching, and his works had a significant impact on educational thought.

9. Herbert Spencer: Spencer was an English philosopher, biologist, and social theorist who developed a comprehensive philosophy known as Spencerianism. He believed in the unity of knowledge and the evolution of all phenomena, including societal development.

10. Aristotle: Although Aristotle is often associated with realism, he also proposed some idealistic concepts. He believed in the existence of abstract essences and forms that underlie the physical world, although he differed from Plato's understanding of these ideas.

11. John Locke: Locke was an English philosopher who is primarily known for his empiricist views. However, he also acknowledged the existence of abstract and universal ideas, which can be considered as idealistic elements in his philosophy.

12. Johann Gottfried Herder: Herder was a German philosopher, theologian, and literary critic who advocated for a type of idealism known as cultural relativism. He emphasized the importance of cultural diversity and the unique characteristics of different nations and societies.

These are some of the prominent exponents of Idealism throughout history.