Henry C. Allen was born October 2, 1836 in the village of Nilestown, near London Ontario. He studied medicine at the College of Physicians and Surgeons in Ontario, Canada and received his homeopathic training at Western Homeopathic College (AKA Cleveland Homeopathic College) in Cleveland, Ohio where he graduated in 1861. Allen was a member of several homeopathic societies including the AIH, IHA, and ones in England and India. Besides writing many articles in this and other homeopathic journals he wrote numerous books. Some of Henry Allen’s well-known works include:
- Keynotes of the Materia Medica with Nosodes
- The Materia Medica of the Nosodes
- The Homeopathic Therapeutics of Intermittent Fever
- The Homeopathic Therapeutics of Fever
- Therapeutics of Tuberculous Affections
He also revised Boenninghausen’s Slip Repertory, which he updated and arranged for rapid and practical homeopathic work.