Bron Dooku was born around 13 BBY into the House Dooku, a powerful and influential house on the planet Serenno, to Count Adan Dooku, and his wife, Maite Dooku. At some point, his mother died, leaving Adan to raise Bron on his own. During his father's reign, Bron regularly travelled with Adan aboard the Dooku airship Windrunner. As part of his training to become the next Count, he was taught by his father about politics, and how to look at situations realistically and pragmatically.
In 3 BBY, Bron was present on Alderaan for the twenty-fifth anniversary of the Alderaan Ascendancy Contention. During the reception he met Leia Organa and complimented her on her beauty.
Later that evening, he was in his bedroom in the suite he shared with his father when he was awakened by the argument between his father and Bail Prestor Organa. When he came out of his room to see what the commotion was, he witnessed his father being shot and killed by an Imperial assassin, Jahan Cross. Organa quickly grabbed Bron and got him under cover for safety as security forces gave chase, intent on finding Bron's father's killer.
Following the death of his father, Bron went with the other House Lords aboard the Windrunner to decide his fate. He then met Jahan Cross, whom he knew as Ambassador Cross's son. Bron was then kidnapped by Aveca Dunn during the Bloodskulls attack, and was rescued by Cross. Bron was taken to Otoh Dooku, where Borgin's security chief Hovus Jorrick and his guard watched over him until Cross and Candra Tymon took him. He was pursued by Jorrick's guard and Boba Fett, until Fett fired a missile at his shuttle, appearing to kill Bron.
In reality, though, Bron had been taken to Alderaan to be raised by Bail Organa until he took his title and position as Serenno's regent if he wanted to.
While Bron Dooku's eye color was blue throughout Star Wars: Agent of the Empire—Hard Targets, the cover of the series' Agent of the Empire – Hard Targets 5 had them brown.