American Heart Association
The American Heart Association grew out of a set of smaller precursor groups. The primary precursor was the Association for the Prevention and Relief of Heart Disease, formed in New York City in 1915, to study whether patients with heart disease could safely return to work. Several similar organizations formed or evolved in Boston, Philadelphia, and Chicago in the 1920s. Recognizing the need for a national organization to share research and promote findings, the American Heart Association was formed in 1924 by six cardiologists representing several of these precursor groups.
American Society of Hypertension
The American Society of Hypertension (abbreviated ASH) was an American non-profit professional society dedicated to advancing research on hypertension and related cardiovascular diseases. 
The ASH was founded in 1985 by 17 scientists and physicians. In 2005, the ASH cut ties with the "American Journal of Hypertension" over a dispute over control of content published in the "Journal". In 2006, the society became the center of a dispute over the appropriate role of pharmaceutical industry in medical research. The dispute prompted several members of an ASH group convened to write a new definition of high blood pressure to resign from the group; those resigning included former ASH president Michael H. Alderman. In 2017, the society dissolved and merged with the American Heart Association. The "Journal of the American Society of Hypertension", which was originally the official journal of the ASH, is now affiliated with the AHA.