For other people named Henry Jackson, see Henry Jackson .
Jackson was born in Grenada to Walrond Jackson, who became the Anglican Bishop of Antigua. He received his education in England at Clifton College and the Royal Military Academy. After his education, Jackson went into the military, serving for the Royal Artillery from 1870 to 1885, reaching the rank of captain. In 1880 while still in the Royal Artillery he was also appointed commandant of the Sierra Leone police.
Source: Wikipedia