For additional meanings of "Decker", please see Decker.

Decker was a Starfleet engineer aboard Deep Space 9 in 2373 serving under Captain Benjamin Sisko.

Around stardate 50930, Decker called in sick, forcing Chief Miles O'Brien to have to recalibrate all the station's EPS regulators so they wouldn't interfere with the station's artificial gravity grid. (DS9: "In the Cards")