85 different papers, letters, and books. No matter what, Rush was always very concerned with the health and safety of others. He was a committed physician who compiled his knowledge of medical theories and used them to promote the health and safety of others. One of Rush’s most important medical find was that he argued for mental illness and discussed how it was the result of imbalances in the brain, rather than just an imaginary illness. By spending time studying and doing research, it earned him