J. Nygren was a Human Starfleet officer in the 22nd century.
In January of 2155, he was named as an EGIL officer on the directory placards at Starfleet Command's Fleet Operations Center, Sol Sector. His office was located in room #1332. (ENT: "Demons", directories)
This character was only mentioned in writing.
He was named after Enterprise first assistant cameraman Jim Nygren.