Logan (Lieutenant)

Lieutenant Logan was a male Human Starfleet officer in the 24th century.

In 2364, he served as one of the chief engineers aboard the . 

While on a mission to the planet Minos in 2364, he came at odds with Lieutenant junior grade Geordi La Forge when the latter was placed in charge of the Enterprise-D by Captain Jean-Luc Picard. The Enterprise came under fire from a Minosian weapon in orbit of Minos, and Logan insisted that La Forge give him command due to his superior rank and experience. Instead, La Forge ordered him back to main engineering. When La Forge decided to do a saucer separation and battle the enemy only with the stardrive section, he placed Logan in command of the saucer section and gave him the order to retreat to Starbase 103. ()

Background information 
Logan was played by actor Vyto Ruginis. He was described in the script as "young, intelligent, competent, and sure of himself." 

He appeared to have replaced Lieutenant Commander Argyle as chief engineer. However, Commander William T. Riker's line in  that engineering matters were overseen by "one of our chief engineers, in this case, [Mr.] Argyle" seems to imply that the ship had more than one chief engineering officer at the time. Therefore, it is possible that MacDougal, Argyle, and Logan all served as chief engineer simultaneously. This practice of having more than one chief engineer seems to have come to an end by 2365, when Geordi La Forge became the sole chief engineer of the Enterprise-D.

Apocrypha 
According to the  "" in DC's TNG series, his full name was "Charles H. Logan" and he was killed while serving aboard the  sometime between 2369 and 2371.

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Humans
Starfleet operations personnel
USS Enterprise (NCC-1701-D) personnel