|Chronological and political information|
- "I'm not paid to be trusting."
- ―Hiram Drayson.
Drayson attended an offworld military academy, but returned home with his education incomplete when his father became ill. He took over his father's shipping business; under his leadership, it became the most successful such business in the Chandrila system. Because of this and his partial Academy education, the Chandrilan government made him the head admiral of the Chandrila Defense Fleet. He reorganized it to run more efficiently, cutting down piracy and smuggling dramatically. It was under his capacity as fleet commander that he came to know Senator Mon Mothma. During the Clone Wars, Drayson was replaced as fleet head by Palpatine-appointed Kohl Seerdon after the passage of Emergency Amendment 121b. At some point in his career, he gained extensive experience serving aboard Star Destroyers, including a professional knowledge of their tractor beam systems.
When Chandrila was brought to heel under the Imperial Starfleet, Drayson was contacted by Mon Mothma, who offered Drayson a role in the military leadership of the new Rebel Alliance as the commanding officer of the Alliance flagship. He accepted.
As the Alliance transitioned into the New Republic, Drayson was made an admiral and placed in command first of the fleet attached to the New Republic Provisional Council, and then of the Coruscant defense fleet. He was tasked with the retrieval of the Katana fleet during the Thrawn campaign. As a military commander, Drayson was considered competent but not very creative, which left him rather outmatched when Grand Admiral Thrawn carried out an elaborate attack against Coruscant. His intense personal loyalty to Mon Mothma also led to some friction with Garm Bel Iblis, as he felt the Corellian General had betrayed Mothma by splitting away from the Rebel Alliance years earlier. Later, Drayson's command experience, strategic mind and extensive contacts made him the ideal candidate for first Director of Alpha Blue, and Mon Mothma appointed him under decree D9020616.
After decades of service in the New Republic Intelligence apparatus, years that earned him the nickname "Old Ghost of Coruscant", Drayson retired from service following Borsk Fey'lya's election and married Joi Eicroth. Their marriage was short-lived, but produced a single child, Bhindi Drayson.
- "Republic HoloNet News Core Edition 14:10:03"—Star Wars Insider 71 (Mentioned only)
- Star Wars: Rebellion
- "Escape Pod Down"—Introductory Adventure Game
- Dark Force Rising (First mentioned)
- Dark Force Rising 6 (Mentioned only)
- The Last Command (First appearance)
- The Last Command 2
- The Last Command 3
- The Last Command 4
- The Last Command 5
- Before the Storm (First identified as Hiram)
- Shield of Lies
- Tyrant's Test
- Specter of the Past
- Vector Prime (Mentioned only)
- Agents of Chaos I: Hero's Trial (Mentioned only)
- Enemy Lines I: Rebel Dream (Mentioned only)
- The Unifying Force (Indirect mention only)
- Dark Force Rising Sourcebook
- A Guide to the Star Wars Universe, Second Edition
- The Last Command Sourcebook
- The Essential Guide to Characters
- The Thrawn Trilogy Sourcebook
- "Special Military Unit Intelligence Update"—Star Wars Adventure Journal 15
- Star Wars: Rebellion: Prima's Official Strategy Guide
- Star Wars Encyclopedia
- Star Wars: Behind the Magic
- The Essential Chronology
- A Guide to the Star Wars Universe, Third Edition
- The New Essential Guide to Characters
- The Official Star Wars Fact File 22 (BLA1-2, The Black Fleet Crisis)
- Coruscant and the Core Worlds
- The Official Star Wars Fact File 116 (CAL20, Lando Calrissian)
- The New Essential Chronology
- Star Wars: The Comics Companion
- The Complete Star Wars Encyclopedia
- The Essential Guide to Warfare