P. Jacobson was a Human Starfleet officer in the 22nd century.
In 2154, he was named as a Propulsion Systems officer on the dedication plaque of the Columbia NX-02. (ENT: "Affliction", dedication plaque)
In January of 2155, he was named as an Ops Planning officer on the directory placards at the Fleet Operations Center, Sol Sector. His office was in room #1358. (ENT: "Demons", directories)
P. Jacobson was named after
Enterprise lamp operator Phil Jacobson.