Robert "Rob" Owen McKenzie was a KGB illegal based in Boston. Without notifying the KGB, he married Joyce, and had a baby boy, Oscar. His secret family lived Philadelphia.

According to Rob's Pennsylvania driver's license, he was 5 feet 7 inches tall and weighed 170 pounds, lived on Larchwood Avenue, and was born November 23, 1966.

Robert was substantially younger than Phillip, although the two were friends.

In the Pilot, he was fatally stabbed on a mission. His baby is later sent back to Russia, to be raised by his parents.