Jacob was a crew member of the Gnosis.
He present during the Crisis Meeting along with his fellow comrades Ice, Corrupt and Wurm. When the meeting was interrupted by Agents Johnson, Jackson and Thompson, Jacob with his fellow crewmen, Corrupt and Ice, worked as a team to jack out of the Matrix. During the fight to survive Jacob was shot and wounded, however he managed to survive. He was most likely killed when Bane sets off the EMP aboard the Caduceus and the Gnosis is subsequently destroyed.
When Neo returned to Zion many approached him asking for his help as The One. Jacob's mother was the first to speak, offering him a gift and saying "Neo, please. I have a son, Jacob, aboard the Gnosis. Please, watch over him."