Jonas Whitfield was an officer on the Black Rock, a ship owned by Magnus Hanso. In 1867, the Black Rock docked in Tenerife, Canary Islands, where Jonas bought a number of men to serve as slaves, among them Ignacio and Ricardo. After the Black Rock crashed on the Island, Jonas killed all of the prisoners, except for Ricardo. Jonas was killed by the Man in Black in black smoke form alongside the entire ship's crew. ("Ab Aeterno")
The casting call describes him as "[JONAS WHITFIELD] Early to mid 30s; English; must speak with authentic accent. He’s crisp and his bearing is of a British military officer. Athletic and agile, he’s worked hard to rise up the corporate ladder and make something of himself. He believes in survival of the fittest...GUEST STAR."