John R. Callahan, Esq [1612] ⁵

   Another name for John was John R Callahan.

  Noted events in his life were:

• He graduated from Amherst College with a BA in 1889 in Amherst, Hampshire County, Massachusetts. ^{4 8}

• He worked as a Lawyer in Holyoke, Hampden County, Massachusetts. ⁸

• He worked as a Lawyer 1889 to 1891 in Northampton, Hampshire County, Massachusetts. ^{4 8} Beg.an to study law in the office of Captain David Hill for two years prior to attending Boston University Law School

• He resided at Bay Road in 1920 in Hadley, Massachusetts. ^{2 8}

• He resided at 10 Taylor Street in 1900 in Holyoke, Hampden County, Massachusetts. ^{9 10}

• He appeared on the Federal census in 1920 in Hadley, Hampshire County, Massachusetts. ²

• He appeared on the Federal census in 1900 in Holyoke, Hampden County, Massachusetts. ¹⁰

• He appeared on the Federal census in 1880 in Old Hadley, Hampshire County, Massachusetts. ¹¹

• Graduate: Boston University Law School, 1891, Boston, Massachusetts. ¹²

• Graduate: Hopkins Academy, Hadley, Hampshire County, Massachusetts. ¹³ Though once a private school, Hopkins Academy is Hadley's public Middle and High School for students in grades 7-12. Hopkins was founded in 1664 thanks to an endowment from Edward Hopkins, a wealthy Connecticut merchant. Hopkins Academy is the fifth oldest school in continuous existence in Massachusetts, the seventh oldest in New England.

John married Katherine A. Griffin [1545] [MRIN: 679], daughter of John Bartholomew Griffin [1469] and Mary T. Lawler [1481], on 23 Aug 1896 in Holyoke, Hampden County, Massachusetts.^{1 2 3 4} (Katherine A. Griffin [1545] was born about 1863 in Holyoke, Hampden County, Massachusetts ¹⁴.)