There are many writers who have contributed to the development of homeopathic materia medica. Some of the most well-known include:

1. Samuel Hahnemann: The founder of homeopathy, Hahnemann wrote extensively about the use of highly diluted substances in the treatment of illness. He is best known for his work “Organon of the Medical Art,” which outlines the principles of homeopathy.

2. James Tyler Kent: Kent was an American homeopathic physician who is known for his contributions to homeopathic materia medica. He wrote “Repertory of the Homeopathic Materia Medica,” which is still widely used today.

3. William Boericke: Boericke was an Austrian-American homeopathic physician who wrote “Pocket Manual of Homeopathic Materia Medica.” This book is considered one of the most comprehensive and widely used homeopathic reference books.

4. George Vithoulkas: Vithoulkas is a Greek homeopathic physician and teacher who has written several books on homeopathic materia medica, including “The Science of Homeopathy” and “Essence of Materia Medica.”

5. Robin Murphy: Murphy is an American homeopathic physician who has written several books on homeopathic materia medica, including “Homeopathic Clinical Repertory” and “Homeopathic Medical Repertory.”