- Birth Date
- 6 July 1819
- Death Date
- 15 March 1895
The Stoddard account says that David came with his daughter. However, his daughter, Margaret, is seen on the ship Ellen Maria in 1852 with David's wife. The two women made the overland journey with the 1852 Smoot Company. Margaret's autobiography confirms that her father was already in the Valley when she and her mother arrived.
David also participated in the effort to rescue the emigrants stranded in Wyoming in the winter of 1856.
Obituary confirms birth and death dates.
- Age at Departure: 31
- Age at Departure: 37
- Cook, David Simpson, Reminiscence in Ruth P. Tippets, From the wee hoose among the heather . . . to the wee hoose on the Weber: ancestors and descendants of David Simpson and Janet Hunter Cook , , 18-19.
- Fifteenth Ward, Record of Members.
- "Names of Persons Who Volunteer to Go as Teamsters." Offerings for the assistance of the P. E. F. immigrants, 1856 October. Perpetual Emigrating Fund Company general files, 1850-1887.
- "Obituary Notes--David Mustard," Deseret Weekly, 30 March 1895, 480
- Sant, Margaret, Autobiography, in Joel Edward Ricks, CacheValley Historical Material, reel 4, item 97, 2.
- Stoddard, David Kerr, Autobiographical sketch.