Frank was born in 1868 in Massachusetts. He passed away in 1924. 
Frank B. Gilbreth was a well-known engineer who is remembered as a pioneer of motion study, which studies human movement in an effort to reduce fatigue and increase efficiency, and also as the father of the Gilbreth family in the best-selling 1948 book, Cheaper by the Dozen, written by his children Frank Bunker Gilbreth, Jr. and Ernestine Gilbreth Carey. Frank Gilbreth and his wife, Lillian (Moller) Gilbreth, in addition to running a consulting company together, had a family of twelve children, eleven of whom lived to adulthood.
↑ United States Passport Applications, 1795-1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV5B-HRBX : 16 March 2018), Frank B Gilbreth, 1920; citing Passport Application, New York, United States, source certificate #12548, Passport Applications, January 2, 1906 - March 31, 1925, 1149, NARA microfilm publications M1490 and M1372 (Washington D.C.: National Archives and Records Administration, n.d.).
↑ United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6D1-KTV : 12 April 2016), Frank Gilbreth in household of Hiram Gilbreth, Maine, United States; citing p. 55, family 461, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,057
↑ 1920 United States Federal Census Year: 1920; Census Place: Montclair Ward 3, Essex, New Jersey; Roll: T625_1030; Page: 6A; Enumeration District: 83
↑ Find A Grave, database and images (https://www.findagrave.com : accessed 19 June 2018), memorial page for Frank Bunker Gilbreth, Sr (7 Jul 1868–14 Jun 1924), Find A Grave Memorial no. 23863208, ; Maintained by Find A Grave Cremated, Ashes scattered at sea, who reports a Ashes scattered over the Atlantic Ocean..
1920 census - "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M45K-2YD : accessed 27 November 2018), Frank Gilbreth, Montclair Ward 3, Essex, New Jersey, United States; citing ED 83, sheet 6A, line 35, family 113, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1030; FHL microfilm 1,821,030.