In 32 BBY, he lived on Naboo during the time when the Trade Federation invaded the planet. He later joined Queen Padmé Amidala's group and traveled to the Gungan Sacred Place to form an alliance with Boss Nass in their fight against the invaders. The battle ended when the people of Naboo and the Gungan Grand Army successfully defeated the Trade Federation together.
Following the declaration of the New Order, Jenn joined the Galactic Empire where he was promoted to colonel in the Imperial Army. He later served as a commanding officer of the storm commandos after Crix Madine sided with the Rebel Alliance during the Galactic Civil War.