- "Wait, the bust in your lobby is of my stupid brother?"
- —Ray Palmer on his brother[src]
Sydney Palmer is the brother of Ray Palmer. After his brother joined the Legends in their time travel, leaving 2016 and presumed dead, Sydney acquired Ray's technology and continued his brother's work in robot engineering, becoming known as the father of the robotics industry by 2147.
Ray greatly implies that he and Sydney don't get along.
Ray theorizes that Sydney worked for Felicity Smoak at Palmer Technologies, and at some point acquired his brother's A.T.O.M. Exosuit technology, claiming it as his own after Ray's disappearance, and sold his research to the military.
Sydney passed on the Palmer name, and his descendant, Dr. Brice, continued his passion for robotics in the Kasnia Conglomerate, with a bust of him appearing in the lobby of the building she worked in. According to her, Sydney was the founder of the company that would eventually produce robotic enforcers, dubbed A.T.O.M. robots by Ray, for the Kasnia Conglomerate.
DC's Legends of Tomorrow
- "Progeny" (bust)