American Psychologist who made significant contributions to  the development of   modern psychology

One of the most influential American psychologists who made significant contributions to the development of modern psychology is William James.

1. Early Life: William James was born on January 11, 1842, in New York City. He was the eldest of five children. His father was a wealthy businessman, and his mother was a homemaker.

2. Education: James studied chemistry and anatomy at the Lawrence Scientific School at Harvard University. He later switched to medicine and graduated from Harvard Medical School in 1869.

3. Career: James began his career as a lecturer in physiology at Harvard University in 1872. He later became a professor of psychology and philosophy.

4. Contributions to Psychology: James is best known for his work in the field of psychology. He is often referred to as the father of American psychology. His book, "The Principles of Psychology," is considered a classic in the field and laid the foundation for many of the concepts that are still used in psychology today.

5. Pragmatism: James is also known for his philosophy of pragmatism. He believed that the value of an idea should be judged by its practical effects and consequences.

6. Death: James died on August 26, 1910, in Chocorua, New Hampshire. His work continues to influence the fields of psychology, philosophy, and education.