Jona Grumby was a naval officer. He was male and served within the Imperial Navy. Later in his life, he served in the Corporate Sector Authority's Picket Fleet.
Grumby, a renowned captain, had a career that spanned three decades in the Imperial Navy, in addition to his time in another fleet before that. Grumby was injured during the Battle of Ogoth Tiir, resulting in the loss of his ability to walk. He was known as a fearless captain with a sharp mind, but he was compelled to retire. Grumby used a hover-chair to get around, and he was frustrated by his forced inactivity because he believed he still had the ability to lead effectively.
Apparently, the Corporate Sector Authority's Picket Fleet recruiters shared this opinion and sought him out to work for them. Grumby taught new officers within the Picket Fleet and was responsible for capturing a significant number of smugglers and pirates. In doing so, he rose to the position of commodore and was expected to eventually be promoted to the rank of admiral.