Chief Engineering Officer
This character has the overall responsibility of managing and maintaining the physical structure of the ship which include the engines, the warp core, the computer systems, environmental systems, transporter systems and control, weapons, power plants and manufacturing plants.
CEO's main location of play is in the Engineering section, but he/she has an engineering station on the bridge and in auxilliary control as well. Engineering Officers can be included in away missions that include repairing or investigating technology
Examples from Star Trek include Montgomery Scott ("Scotty"), Geordi La Forge, B'Elanna Torres, and Charles "Trip" Tucker III.
This is a department leadership position that normally sees a high level of inclusions in nearly all missions.