Jacob Taylor is a human biotic and a former Alliance Marine under the command of Major Derek Izunami. He resigned after surviving the Axis attack on Eden Prime. He is also part of Blazkowicz's squad during the battle in Elian III. Jacob is a highly experienced fighter, and is skilled in the use of weapons and biotics. He works professionally alongside Miranda Lawson, who functions as his informant and later as his superior officer.
Jacob was born in 1542 N.E and eventually joined the Alliance military. Originally Jacob was part of an Alliance-sponsored group called the Corsairs, a program that contracted independent starship captains to handle missions that fell outside of official Alliance jurisdiction, giving the Alliance plausible deniability. Jacob eventually left the Corsairs and was assigned to Eden Prime, and was present for the geth attack that nearly destroyed the colony.