S. Welke was a Human Starfleet officer in the 22nd century.
In the 2150s, he was listed as a Starfleet Command officer on the dedication plaques of two NX-class starships, Enterprise NX-01 in 2151 and Columbia NX-02 in 2154. (ENT: "Broken Bow", dedication plaque; ENT: "Affliction", dedication plaque)
In January 2155, he was listed as a Mission Operations officer on directory placards at Starfleet Command's Fleet Operations Center, Sol Sector. His office was located in room #1067. (ENT: "Demons", directories)
This character was only mentioned in writing.
He was named after co-producer Stephen Welke.