Shadrack Keen was born in Boston, Mass., in Sept. 1796, son of Jubal & Sarah (Rock) Keen.  He married in the Second Baptist Church in Boston on 02 Nov 1817, Mary W. Jackman (recorded variously as Mary W. Jackson & Nancy W. Jackman), daughter of Matthias Atkinson Jackman and his wife Abigail Worthen. They had at least nine children, some as yet unidentified. April 11, 1862, Shadrach Keen died at age 65 years 7 months at 19 Havre St. of rheumatism carditis. He is buried in the Bennington St. Cemetery in East Boston. A photo of his grave can be viewed at [Findagrave.com Memorial #43122456]
During the War of 1812, he was a private and served first in Capt. S. Mansfield's Company, Lt. Col. White's Regiment, from 09 Sep 1814 for training; then from 14 Sep in Capt. V. Ripley's Company, in Lt. Col. W. Ryerson's Regiment, until 24 Sep. This company was raised at Salem, MA, and served at Portland. Beginning 25 Sep., he then served with Capt. S. Blake's Company, in Lt. Col. W. Ryerson's Regiment, until 7 Nov. The company was raised at Paris, and served at Portland. 
After the war he became a labourer and resided on Fish St. in North Square, Boston, and East Boston. Later in life he was at one time (1848) a recruiting officer. He was listed in East Boston as a restorator in the 1850s. He was a pensioner by 1860.
"Shadrach, Meshach, and Abednego are men recorded in the book of Daniel Chapters 1–3, known for their exclusive devotion to God. In particular, they are known for being saved by divine intervention from the Babylonian execution of being burned alive in a fiery furnace."
Date: ABT SEP 1796
Place: Boston, Suffolk County, Massachusetts, USA
In 1820 a labourer; a US recruiting officer in 1848; 1850-1857, a restorator; 1860 a Pensioner. 
"Shadreck Keen & Mary W. Jackson 16 Sept 1817"
Date: 02 NOV 1817
Place: the Second Baptist Church, Back Street, Boston, Suffolk County, Massachusetts
"Shadrack Keen & Nancy W Jackman married by Rev Thomas Baldwin, DD, 2 Nov 1817."
"1817 - Nov 2 Mr. Shadreck Keen, Miss Mary W Jackman"
Date: 11 APR 1862
Place: 19 Havre St., Boston, Suffolk County, Massachusetts
"April 11, 1862, Shadrach Keen, died at age 65y 7m, residence & place of death 19 Havre St, cause Rheumatism Carditis, married male, place of birth Boston, occupation [blank], father Tubal born Pembroke, mother Sarah born Salem." 
↑ John Baker, Massachusetts. Adjutant General's Office, compiler, Records of the Massachusetts volunteer militia called out by the Governor of Massachusetts to suppress a threatened invasion during the war of 1812-14 (Boston, MA: Wright & Potter Printing Co., 1913), pp. 136, 251, 255
online at Archive.org
↑ 1855 MA State Census, population schedule, Suffolk Co., MA, Ward 2, enumeration #471/936, Massachusetts State Archives LDS films 953958 & 953959
↑ 1850 US Census, population schedule, Suffolk Co., MA, NARA Micropublication M432, Roll 335, Ward 4, p. 57, enumeration #556/920, lines 3-7
↑ 1860 US Census, population schedule, Suffolk Co., MA, Ward 2, p. 158, Lines 34-36, enumeration #731/1298