Argyle was played by actor Biff Yeager. Argyle appeared to have replaced Sarah MacDougal as Chief Engineer and was apparently replaced himself by Lieutenant Logan prior to TNG: "The Arsenal of Freedom". However, Commander William T. Riker's line in "Where No One Has Gone Before" that engineering matters were overseen by "one of our chief engineers, Lt. Commander Argyle in this case." seems to imply that the ship had more than one chief engineering officer at the time (possibly relating to the prolonged teething problems of the Galaxy-class). Therefore, it is possible that MacDougal and Argyle both 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. Of the Enterprise-D's chief engineers prior to La Forge, Argyle was the only one to appear more than once.
In a review of "Where No One Has Gone Before" for TV Squad, Wil Wheaton suggested (with the caveat that this was based on his memories of 20-years past, and that he was only 14 years old at the time), that the character of Argyle was under consideration by producers to become a permanent chief engineer for the Enterprise until they began receiving letters campaigning for Argyle, referencing one of his episodes before it had aired, and fans began complaining that they had been spammed via mail which asked them to write in on behalf of Yeager. 
According to the DC Comics comic book "Suspect", his first name was "Terence" and he was murdered around 2369 or 2370. However, according the current Pocket Books continuity, his first name was 'Michael', and he was killed aboard the USS Excalibur during the Borg incursion of 2373.
|Chief engineers of the starships Enterprise|
|Enterprise NX-01:||Tucker • Kelby|
|USS Enterprise-D:||MacDougal • Argyle • Logan • Lynch • La Forge|
|USS Enterprise-E:||La Forge|
|ISS Enterprise NX-01:||Tucker|
|ISS Enterprise (NCC-1701):||Scott|
|USS Enterprise (alternate reality):||Olson • Scott • Chekov|