Samuel Hahnemann was the founder of Homoeopathy. He established the fundamental principles of the science and art of Homoeopathy.He is called the Father of Experimental Pharmacology because he was the first physician to prepare medicines in a specialized way; proving them on healthy human beings, to determine how the medicines acted to cure diseases. Before Hahnemann, medicines were given on speculative indications, mainly on the basis of authority without experimental verification.Dr. Hahnemann described the different aspects of ‘acute’ and ‘chronic’ diseases. Acute diseases are transitory; they have a beginning and an end, whereas the chronic diseases are co-existent with life. Either they are present in a manifest or a latent state. From this work came the chronic miasms of Psora, Syphilis, and Sycosis.Hahnemann discovered the primary and secondary actions of remedies. The primary action results from the first encounter between the vital force and the external agent, and the secondary action is a result of the vital force’s reaction to the symptoms of that primary encounter. This discovery led him to the curative powers of poisonous substances.Dr. Hahnemann treated thousands of difficult and chronic cases that defied the best care from allopaths all over Europe. Thus, he became so famous that physicians from Europe and America came to him for coaching in the new science and art of healing, called Homoeopathy.