From brief online research, hopefully correct: [corrections and additions requested]
Thomas Guy Langdale was born at Cincinnati, Ohio, about October 1866, the son of Robert Hill Langdale and Harriet Isabel (Megrue) Langdale. Rev. Langdale graduated from the University of Cincinnati in 1887 and Chicago Theological Seminary in 1891. Before Epping, New Hampshire, he ministered at Clark, South Dakota and in the Boston, Massachusetts area. After his term at Epping, he returned to Massachusetts, at Salem, Haverhill and Lawrence.
On January 15, 1902, Rev. Langdale married Edith Houghton Pearce, daughter of Thomas H. Pearce and Mary Jane (Fowles) Pearce. Rev. and Mrs. Langdale had at least one child, daughter Edith born in 1902.
Rev. Langdale died before 1930 or early that year, as implied from the 1930 Census, in which Edith described herself as a widow. I haven't found his death date or his burial site.
Epping, New Hampshire, October 31, 1904
Dear Cousin Belle:
A pleasant but much appreciated surprise came to me with the return of Mother after her good visit with you in the books so kindly put into my hands for use until called for by Cousin Helen. I am particularly interested in reading books of the times represented by these which you send, partly because I have a natural liking for books that have the wisdom of years to commend them & partly because they give one an opportunity to see at first hand the forms great & abiding truths took in early days & to recognize how much we owe in the present to the thought & life of the past.
Though I have Edwards Works in Four Volumes embracing both "The History of Redemption" & "The Religious Affections" & have read both of them through I am specially glad to have them in separate volumes - as I profess to be a great admirer of Jonathan Edwards.
The other books so far as I know them at all, I know them by reputation & so value the possession of them all.
Please tell Cousin Helen that we are very sorry she cannot arrange at the present time to make us a visit. When she is so situated that she can do so we hope she will let us know & we shall be glad to suit her convenience.
All at the Epping Parsonage send best wishes to you and yours.
Very sincerely yours,
T. G. Langdale
If you have corrections and/or additions to the information above, please leave a comment or contact me directly.