D. Takemura was a member of Starfleet in the 22nd century.
In 2154, he was named as a Flight Software officer on the dedication plaque of the Columbia NX-02. (ENT: "Affliction", dedication plaque).
In January of 2155, he was named as an EECOM officer on directory placards at the Fleet Operations Center, Sol Sector. His office was in room #4243. (ENT: "Demons", directories)
D. Takemura was named after
Enterprise visual effects coordinator David Takemura.