Aaron (Admiral)
Admiral Aaron was a male Human Starfleet flag officer in the 24th century.

In 2364, Aaron held an important position at Starfleet Headquarters. At some point, Aaron became infected with a parasitic being and was under the control of an alien mother creature that had taken residence in Lieutenant Commander Dexter Remmick. 

When the  returned to Earth to respond to suspicions of a conspiracy orchestrated by these creatures, Aaron greeted Captain Jean-Luc Picard and invited him to dinner. When Picard arrived, co-conspirators Savar and Tryla Scott, as well as several security commanding officers, all joined Aaron in cornering him in a dining hall and showing him how their people fed on live vermicular lifeforms. 

When William T. Riker posed as one of the possessed officers in order to recover Picard, Aaron fired on the Enterprise officers and fled, seeking Remmick. Picard and Riker disabled Aaron with phaser fire just outside of Remmick's communications room. The parasite fled Aaron's fallen body and was ingested by Remmick. ()

Aaron was part of Commander Riker's memories while being infected on the surface of Surata IV and treated in sickbay. ()

Appendices

Background information 
Admiral Aaron was played by Ray Reinhardt.

This senior admiral was originally named "Richard Erik". He was called that in a story outline which Tracy Tormé sent as a memo to Maurice Hurley on  (while the episode had the working title "Assassins").

Aaron was described in the script as "old and lean – hollow cheeks and cold, piercing eyes, beneath a shock of white hair." 

Aaron's rank insignia, a triangle with two pips, would seem to place him above Savar and Mark Jameson, though all three are only described as "admiral". Savar and Aaron are described as "senior admirals" in the script.

Apocrypha 
In the game Star Trek Conquest, Aaron was a player character in a reality where the Milky Way Galaxy was embroiled in conflicts between multiple species and cultures. In 2364, Aaron held the rank of commodore and was in command of a fleet during the conflict.

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Humans
Starfleet Headquarters personnel
Starfleet command personnel
Starfleet flag officers