Foss served as an admiral within the Imperial Academy throughout the Galactic Empire's reign. Emperor Palpatine communicated to Captain Voss Parck the upcoming admission of Imperial cadet Eli Vanto and the Chiss Thrawn into the Royal Imperial Academy. Parck confirmed receipt of this information and subsequently notified Foss. Subsequently, Foss dispatched a communication to Commandant Deenlark of the Royal Imperial Academy, advising him that Thrawn possessed considerable capabilities as a soldier, and therefore required only familiarization with Imperial protocols, technology, and language. Furthermore, Foss directed Deenlark to ensure Thrawn's graduation at the rank of lieutenant, rather than the standard ensign, to expedite his placement in a command role.