Who Was "Mr Rang" in Tolkien's Letters?

In The Letters of J.R.R. Tolkien (1981), there is about eight pages worth of text comprising "Drafts for a letter to 'Mr Rang'" (Letter no. 297, pp. 379-387). I never knew there was any mystery about the identity of Mr. Rang until my friend Jessica Yates just sent me a draft of her short piece on this topic (now published here). My research of some ten years ago identified a different person. With Jessica's permission, I present my findings here. 

According to the Humphrey Carpenter's headnote to the letter, Tolkien had written at the top: "Some reflections in preparing an answer to a letter from one Mr Rang about investigation into my nomenclature. In the event only a brief (and therefore rather severe) reply was sent, but I retain these notes". Tolkien had added the date of August 1967. 

I have long believed that this Mr. Rang was Jack C. Rang, who delivered a talk "Two Servants" (on Niggle and Sam Gamgee) at the Tolkien Symposium at Mankato, Minnesota (somewhat south and west of Minneapolis) on 28-29 October 1966. This talk was subsequently published in February 1967 in "The Tolkien Papers", an issue of Mankato Studies in English.  Here we have a Mr. Rang who showed considerable interest in Tolkien in 1966, the year before Tolkien dated his notes in reply to a letter from a Mr. Rang. It has always seemed to me likely that these two Rangs were one and the same person.

Jack Charles Rang was born in Chicago, Illinois, on 27 September 1923. He was the only child of Carl John Rang (1890-1944), a bank cashier, and his wife Lena B. Willey (1888-1976). Jack died at the age of 87 in Centerville, Ohio, on 7 February 2011. On obituary in the Dayton News (11 February 2011) tells us that:

He served in the U.S. army during World War II and was a graduate of Northwestern University [B.S. 1948], receiving advanced degrees from Aquinas College [M.A. 1965] and Northwestern. Jack had a life-long love of the theatre and was involved in acting and directing many educational and community theatre productions. He was a radio and television personality and taught broadcasting courses, most recently at the University of Dayton, from which he retired in 1994 with the rank of Professor Emeritus.

Jack C. Rang had married in Grand Rapids, Michigan, in 1948, and was survived by his wife, Mary Ruth Rang (b. 1927), and their son, daughter and grandson. 

If this isn't the Mr. Rang that Tolkien wrote to in 1967, it is undoubtedly the Jack C. Rang who presented on Tolkien at Mankato in 1966.