Fritz Haber is a main character on the first season of Genius. He was a German chemist who received the Nobel Prize in Chemistry in 1918 for his invention of the Haber–Bosch process, and weaponizing poisonous gases during World War I.
He is portrayed by Richard Topol.
Fritz informs his colleague Albert Einstein of Germany ordering a national holiday in the recently deceased Walther Rathenau's remembrance. He also assures Albert, who is pondering leaving Germany due to the growing Nazi nationalist movement, that leaving Germany would not be the best option for handling such a problem. Albert then goes to evaluate Fritz for being a devout Christian even though he was born a Jew; stating that men like Adolf Hitler would not tolerate even that. Fritz is then shown a statement from Prof. Philipp Lenard saying that Einstein should be bared from attending the Annual Conference for German Science, stating that his "Jewish-physics" have no place there.
During a parade for the mouring of Walther Rathenau's death, Fritz stands next to Albert and Elsa, who are noticed by Jewish citizens and praised for appearing at the observation. However, the parade is interupted by Nazi brownshirts yelling to the crowd that Rathenau's assassins were German heroes.