Alfred Einstein Cohn (1879–1957) was an American physician and author who worked at the Rockefeller Institute for Medical Research, where he was the director of the Laboratory for Heart Disease.
He then went on to study in Austria, Germany, and England; where he, along with James Mackenzie, discovered the presystolic murmur.
When the First World War broke out, he served in the Army Medical Reserve Corp, and then as Lieutenant colonel in the American Expeditionary Force, where he was a senior consultant on circulatory disease.
In 1920 he took a job at the Rockefeller Institute for Medical Research, where he maintained an office even after retiring up until near the end of his life.
[4] After studying cardiology for a long time, Cohn took in interest in humanities,[5] causing him to break with Mirsky.