Matthew has mentioned the first English speaking Transfiguration parish here:

http://orthodoxhistory.org/2010/01/26/the-first-english-speaking-parish/

One of the converts he mentioned was a gentleman named Reginald Wright Kauffman.  Kauffman lived from 1877-1957 and was a noted author. He also served as a newspaper editor for a time.  He was raised Episcopalian and apparently considered Mormonism for a time.  He and his wife Ruth authored a book on it in 1912. You may still purchase a reprint from the University of Illinois Press.  Despite this, he became Orthodox at the Transfiguration parish in New York in 1920.  Here is a newspaper description of that event:

1920-07-20 – Reginald Wright Kauffman converts at Transfig Church (NY Times)

To the best of my knowledge, he remained Orthodox, but I am not sure of that.  Fr. Daniel H.B. Montgomery mentioned Kauffman as a “pioneering convert” in “Your Orthodox Mission to America” Word Magazine (1957): 207-8, 212.  This need not mean Kauffman remained Orthodox and if anyone has any information on Kauffman that relates to his Orthodoxy, we welcome feedback.