Admiral Vassery was a Human Starfleet flag officer who served as the commanding officer of Douglas Station during the 2380s. In appearance, he was bald, had a thick, gray mustache, and black eyebrows. He was known to have the tenancy to mispronounce things.
Vassery and his aide visited the USS Cerritos in 2380, he awarded medals to Captain Carol Freeman and Lieutenant Beckett Mariner for their bravery and ingenuity in dealing with the terraforming emulsion. After awarding them, his mispronunciation of sense-oars led to Mariner commenting on it and telling him that Freeman was making fun of him. Vassery took offense, asking if they were really making fown of him. The incident led to Mariner's demotion back to the rank of ensign by Freeman. (LD: "Moist Vessel")
A holographic duplicate of Vassery was later part of Mariner's holoprogram Crisis Point: The Rise of Vindicta. In it, he ordered the Cerritos to investigate – "get in, get me intel, then get out" – who made second contact with the Idlocana VI, as the supposed ship that made contact, the USS San Clemente, did not exist. (LD: "Crisis Point")