title: Jacob Aaron Westervelt
context: Jacob Aaron Westervelt (January 20, 1800– February 21, 1879) was a renowned and prolific shipbuilder who constructed 247 vessels[2] of all descriptions during his career of over 50 years. From 1853 until 1855 he was Mayor of New York City.[4][5]
question: When was Jacob Aaron Westervelt born?
answers: January 20, 1800