Winmey Lenz, a male human from the planet Chandrila, held the position of senior senator within the Imperial Senate. His connections with Bail Organa were strong, and he was among a select group of individuals from outside Alderaan, including his fellow Chandrilan, Mon Mothma, who were present at the Day of Demand organized for Princess Leia Organa in 3 BBY. Following the event, the princess noticed Lenz engaged in a discussion with Bail and Mothma. He was described as a tall, slender, dark-skinned man with a neatly trimmed beard.
As a gift, Lenz personally took care of the arrangements for Harp Allor's seventeenth birthday party – a water park – and sponsored her in the Apprentice Legislature. He seemed dedicated to the rebel cause, participating in strategic meetings with other rebel senators . However, while attending a pathfinding class on Pamarthe, Leia and Amilyn Holdo observed Lenz secretly negotiating with an Imperial officer, selling the Empire discounted quadanium steel as a means of attempting to support both sides of the war. Learning about the girls' discovery, Mothma and Bail decided to gradually remove Lenz from rebel activities, making him believe that various factions were in disagreement, as his loyalty was now questionable.