Expert
An expert or maven was a scholar who was fully trained or versed in many or all aspects of a particular subject matter or field of study, a competency called expertise. An occupation of expertise was known as a profession.

Doctor Leonard McCoy testified as Captain James T. Kirk's general court martial as "an expert in psychology, especially space psychology." ()

Doctor Janet Wallace was an expert in endocrinology. ()

Doctor Ira Graves was an expert in cybernetics. ()

During the inquiry regarding whether or not Data was the property of Starfleet in 2365, Commander Bruce Maddox was called to the stand as a hostile witness. As the computer verified his identity, it rattled off his current assignment as Associate Chair of Robotics at the Daystrom Technological Institute, and prepared to recall his "major papers" before Jean-Luc Picard interrupted, exclaimed, "Yes, yes, yes. Suffice it to say, he's an expert." () Later that year, following Data's encounter with an Iconian software transmission, the frustrated Geordi La Forge felt the only way to fix Data was "If we had an expert, a Maddox, somebody..." ()

During the extradition hearing of Worf in 2372, Ch'Pok declared Deep Space 9 Chief of operations Miles O'Brien an expert in the field of starship combat, as O'Brien had been decorated 15 times by Starfleet for his actions in this area. When he asked Captain Benjamin Sisko if he had any objections to this, Sisko replied that he had none. ()

Field experts 
 Archaeological expert
 Aviation expert
 Computer expert
 Fiction expert
 Laboratory expert
 Legal expert
 Medical expert
 Military expert
 Mind control expert
 Monster expert
 Munitions expert
 Safety expert
 Technical expert
 Time travel expert
 Transporter expert
 Propulsion expert
 Warp field expert
 Weapons expert

See also 
 Expert witness

External link 
 

Education
Occupations