Steven Hackett

Admiral Steven Hackett is a top-ranking official of the Alliance Navy and commanding officer of the Fifth Fleet. He is based at Arcturus Station.

On relatively equal political status with both Ambassador Udina and Captain Anderson, Hackett was one of the three officers who recommended Commander Shepard as the first human Spectre. During the mission to track down Saren Arterius, Hackett frequently contacts Shepard with key assignments, especially those vital to the Systems Alliance security, and is generally more accepting of Shepard's decisions than Udina.

Admiral Hackett is voiced by Lance Henriksen.

Mass Effect
When the Citadel is attacked by Sovereign, Hackett commands the Alliance vessels that reinforce the battered Citadel Fleet. Trusting in Shepard's 'on the ground' judgement, Hackett leads the fleet to either defend or abandon the Destiny Ascension.

Mass Effect 2
As of Mass Effect 2, Admiral Hackett remains a high-ranking member of the Alliance Navy.

If Shepard is a War Hero, then, on Hackett's orders, all proceeds from weddings held at Shepard Memorial Plaza on Elysium go to benefit the families of veterans and Alliance service members who were KIA. If Shepard is Ruthless, he personally orders no arrests be made against those who tried to extinguish the Shepard Memorial Flame on Torfan. And if Shepard survived the Thresher Maw attack on Akuze, then the Admiral will preside over the unveiling of the Shepard Memorial on that world in 2186.

He also transmits to Shepard the location of the Normandy SR-1 crash site and requests that Shepard place a monument there.

In Lair of the Shadow Broker, Liara T'Soni mentions that Hackett recovered Shepard's dogtags and passed them on to her so that she could return them to their rightful owner.

Arrival
In the final DLC for Mass Effect 2, Arrival, Admiral Hackett asks Shepard to do him a personal favor and rescue his friend, Dr. Amanda Kenson, from a group of batarians who have captured her. After Shepard returns to the Normandy he personally debriefs Shepard to find out exactly what happened during the mission.

Mass Effect 3
Admiral Hackett will return in Mass Effect 3. He was mobilizing the Alliance fleets once the Reapers invaded Earth. Unfortunately, the Reapers proved too powerful, forcing Hackett to sacrifice the Second Fleet to allow the Third and Fifth to escape. He advises Shepard, reinstated into the Alliance military, to go to Mars, where Liara was researching what appeared to be a Prothean superweapon.

Trivia

 * Lance Henriksen voiced Master Gnost-Dural for the Galactic Timeline on BioWare's Star Wars: The Old Republic website.
 * The Shadow Broker has files on Admiral Hackett which can be accessed aboard his ship.
 * He is named after Genesis guitar player Steve Hackett, and his commanding of the Fifth Fleet is in homage to Hackett's most famous solo in the song Firth of Fifth.