Identity:
Heinrich Godefroy Ollendorf was the author of numerous primers on European languages, such as A key to the exercises in Ollendorff's New method of learning to read, write, and speak the French language, New York, 1855.
Life:
He is mentioned in JW's correspondence about 1890.
Bibliography:
New York Public Library on-line catalogue at http://catnyp.nypl.org (accessed 2005).