Doctor Michael Okuda was a Starfleet officer in the 24th century. He was a scientific and research specialist.
In 2368, he was listed as an Advanced Technologies Group officer on the second version of the dedication plaque for the USS Enterprise-D. (TNG: "Silicon Avatar", dedication plaque)
In the 2370s, he was listed as a Science Ops officer on the dedication plaque of several Federation starships. (VOY: "Caretaker", dedication plaque; VOY: "Message in a Bottle", dedication plaque; DS9: "The Dogs of War", dedication plaque)
In 2372, he was listed as a Systems Management officer on the dedication plaque of the USS Enterprise-E. (Star Trek: First Contact, dedication plaque)
This character was only mentioned in writing.