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 Psychopathological Association
Around 1900, William James called for an "American Psychopathological Society". His call was in response to the gap he felt had occurred between normal psychology and more morbid sciences dealing with full-blown insanity. He wrote a proposal for an American Psychopathological Association, and in 1910, the American Psychopathological Association was founded. On May 2, 1910, the American Psychopathological Association was organized at the Willard Hotel in Washington, D.C. Due to the fact that both the American Neurological Association and the American Medico-Psychological Association (now the American Psychiatric Association) were holding annual meetings at the Willard, it was easy for people interested to attend. 
According to the historical membership lists, there were 42 founding members of APPA. The earliest list is from 1911, which reflects the original members as well as five newly elected members. The proceedings of the meeting were published in the June–July 1910 issue of "The Journal of Abnormal Psychology", which was designated the official journal of the APPA.