Horace M. Kallen (1882–1974), Professor of social philosophy, educator, and pupil of F. M. Alexander.
Horace Kallen was born in Austrian Silesia (now part of Poland), and his family moved to the US in 1887. He studied philosophy at Harvard University and at Oxford University. He taught at Princeton University, Harvard University (until 1911), and at the University of Wisconsin-Madison (until 1918). He then became a founding member and professor of the New School for Social Research in New York City, where he remained for the rest of his career.  
He was the author of several books advocating cultural pluralism. He is credited with both coining the term and the concept as early 1906 or 1907. He proposed the ideal that cultural diversity and national pride are compatible. Horace Kallen was a pupil of Alexander
Horace Kallen was a pupil of Alexander. He wrote a review of MSI in 1918 and a review of UCL in 1942. In a conversation in 1958 Kallen briefly relates his discussions with John Dewey about Alexander and his own meeting with Alexander and a demonstration. This conversation is published in Dialogue on John Dewey. (Alexander Murray writes that Kallen said that Alexander had said that James and Delsarte were the sources of his technique. This is not true: Kallen only refers to James in the 1958 conversations.)
Horace Meyer Kallen *11 August 1882 – †16 February 1974.