[3][4] He partnered with his brothers Hugh Hagan and Alexander Hagan, as well as with his maternal uncles, Hugh McDonald and Alexander McDonald.
[5] According to historian Walter Johnson, "John Hagan's yearly routine began in Charleston with slave buying during June and July; he continued in Virginia and then was back in Charleston in September, still buying, before traveling to New Orleans in October.
"[1] Hagan was both a shipper and consignee (intended recipient) of enslaved people who were on the Creole in 1841.
[4] He also provided bequests of cash and real estate for her in two versions of his will.
[4] Per historian Alexandra J. Finley, these children, and two others who died young, were almost certainly Hagan's biological offspring.