In the book's own words, not ours, with obvious scanning errors fixed. Families often supplied these stories to the publisher, so check key dates.
Born 1864
From Centennial portrait and biographical record of the city of Dayton and of Montgomery County, Ohio, containing biographical sketches of prominent and representative citizens, together with the biographi (1897)
ILLIAM KEIFER CALLAHAN, junior member of the firm of W. P.
Callahan & Co., and one of the well-known young manufacturers of Dayton, Ohio, was born in this city on January 8, 1864, and is the son of William P. Callahan, of whom a sketch appears elsewhere in this volume. Mr. Callahan was educated in the Dayton public schools and at the Massachusetts Institute of Technology at Boston,, taking a course in mechanical engineering at the latter. He entered the shops of W. P. Callahan & Co. as an apprentice in 1884, and the following year, upon attaining his majority, he was taken into the firm. Notwithstanding his admission to the firm, he continued and completed his apprenticeship, and then entered the office. He is vice-president of the Gem City Building association. In 1891 Mr. Callahan was married to Miss Lida Ohmer, daughter of George Ohmer, of Dayton, and they are the parents of one daughter — Charlotte. Mr. Callahan is a member of the Masonic order, including the Knights Templar and Thirty-second degree Scottish rite and the Mystic Shrine. He is also a charter member of the Elks society.
As printed in Centennial portrait and biographical record of the city of Dayton and of Montgomery County, Ohio, containing biographical sketches of prominent and representative citizens, together with the biographi (1897). See the original pages. Wording is the original; obvious scanning errors have been corrected, and a few may remain.
The printed record stops around 1897. We trace your line from there down to you, with every source cited.