BIOGRAPHY
Lawrence Trask and his sister Tanya grew up in Sioux Falls, South Dakota, as the children of noted anthropologist, Bolivar Trask. Their happy childhood was spoiled due to the fact that both Trask children were early examples of the major outbreak of mutant births in their generation. Tanya was temporally unstable, possessing chronal powers she could not control that caused her to slip out of time and return suddenly to different points in the past and future. At some point, she vanished altogether. 
Larry was precognitive, experiencing episodes where he connected mentally to different time periods, just as Tanya did physically. At five years old, he accurately predicted the hour and manner of his mother’s death, which left Bolivar Trask painfully aware that his children were different. [X-Men (1st series) #58-59, Uncanny X-Men minus#1]
[Note: Sources vary over whether Larry Trask first received the medallion before or after his mother's death. Sentinels #5 lightly implied that Larry's mother might also have been a mutant, and the medallion was originally designed to suppress her powers.]
With both Tanya and their mother gone, Bolivar and Larry were each other’s only support. Bolivar 
chose to suppress his son’s abilities, giving him a special micro-circuitry equipped medallion that blocked his clairvoyance, as well as any memory of it. His son would not even register as a mutant so long as he wore the amulet. Larry promised his father on the day his mother died never to remove the medallion, and believed his blackout spells were nothing but a form of epilepsy. But while Bolivar rejected his son’s gift, he also couldn’t help but exploit it. The elder Trask occasionally removed the medallion in controlled sessions where he charted the future as Larry saw it. Using his son’s ramblings as evidence, the anthropologist began to fear for the future of mankind in the face of the coming “mutant menace.”
Bolivar decided it was his duty to ensure humanity was protected from the future he learned of from Larry's visions. He studied robotics and began his Sentinel program to create a line of mechanical men programmed with artificial intelligence to shield mankind from mutants when they inevitably emerged. Now in his teens, Larry was a dutiful son willing to support his father’s work and trusted that Bolivar’s “predictions” of the coming genetic war came from his own research. In a twist of fate, Tanya Trask once came back in time in an attempt to stop her father from creating the Sentinels. In the far future, Tanya stabilized her personal time flux and became Sanctity, first recruit for Rachel Summers’ Askani Sisterhood. Rachel followed Tanya back through time and prevented her from altering the timeline, but not before a brief fight. Larry discovered the after effects of their psychic combat, the devastation left in their wake, and realized his father’s predictions were true and mutants walked among them. [Uncanny X-Men minus#1]
Bolivar Trask’s efforts to receive government funding and backing for the Sentinel program had 
starts and stops. The scarcity of mutants at the time made it hard to convince people it was an epidemic in the making. [First X-Men #5] Eventually, however, Larry was away at college when Bolivar finally got far enough in his project to unveil it for the public. Unfortunately, as a programmer, Trask made an excellent anthropologist. His Sentinels almost immediately turned on mankind and mutantkind alike, serving only the Master Mold. Bolivar Trask died helping the X-Men to stop his own creations from carrying out the conquest of Earth. [X-Men (1st series) #14-16]
Unfortunately, Bolivar’s death at the Sentinels’ remote fortress meant word of his demise passed second-hand, and Larry Trask drew his own conclusions. Still convinced of his father’s original predictions, Larry believed the X-Men murdered his father to prevent the Sentinel program from launching. He left college and met with his father’s old friend, Judge Robert C. Chalmers of the Federal Council on Mutant Activities. Judge Chalmers knew of Bolivar’s work and was the only man alive who also knew the meaning of Larry’s medallion. His own research into the subject supported Trask’s fears of a mutant menace, and so Chalmers hired Larry as his “special assistant” to continue the Sentinel program in secret.
Larry Trask proved to be a better logistician that his father and corrected the “run amok and kill everyone” flaw in Bolivar’s original programming for the Sentinels as he rebuilt them. He also crafted a control helmet which allowed him to mentally take control of any Sentinel, if necessary. It was Larry who successfully programmed the Sentinels with the capacity for analytics and 
adaptability found in all future variations of the design. Now the Sentinels could adapt to different mutant powers, craft strategies and devices to neutralize individual opponents. As the Sentinels’ cognitive functions grew, their leader Number Two even began suggesting ideas to Larry Trask for what was logically necessary to fulfill their purpose of protecting humankind by eliminating mutantkind. With Larry’s approval, Number Two and the Sentinels built an entire headquarters secreted away in the Adirondack Mountains as a base of operations and holding facility for mutant captives.
Trask and Chalmers were ready for action when the X-Men made the news fighting with the authorities in Egypt. The Sentinels were reactivated under federal authority and began hunting 
down mutants across the nation and around the globe. The judge and his special assistant also conducted a PR campaign, working the networks to announce and explain their findings that mutants were a threat to normal humans, and must be contained. Trask’s vendetta made him more passionate about the cause than Judge Chalmers, and he believed he would soon have proof that mutants were too dangerous to live. Among his first captives were Iceman and the X-Men’s associates Lorna Dane and Alex Summers.
As the Sentinels continued to round up evil mutants, Judge Chalmers came to visit Larry at the base in the Adirondacks. Chalmers questioned whether the suspended animation capsules Trask was using were humane, a concern Larry balked at considering his prey weren’t “human” to begin with. Their argument grew more heated as Trask felt the judge’s resolve was weakening, and in a fit of anger he ordered the Sentinels to hunt down all remaining mutants and kill rather than 
merely capture. Judge Chalmers ripped off the medallion while trying to knock some sense into his young charge. Larry did admit he had gone overboard and tried to rescind that last directive. However, Number Two was no longer listening. With the medallion gone, Larry now fully registered as a mutant to the Sentinels, and they would no longer follow his commands. His last order would remain.
As Trask struggled to accept the truth about himself, Number Two placed him in a stasis capsule alongside his other fellow prisoners. He received a psychic flash and managed to direct Judge Chalmers by eye contact alone into disabling the containment suit for Alex Summers, Havok. The neo-mutant was strong enough to break free and distract the Sentinels, but Judge Chalmers was 
injured by a Sentinel in the fighting. They stopped everything to save Chalmers’ life, helping Havok and the arriving Cyclops understand how their logic and programming worked. Cyclops convinced Number Two that mutants would continue to be born from humanity unless the source of mutation was dealt with. His logic guided the Sentinels into leaving Earth behind to study the Sun itself, and find the means of preventing its mutation-causing radiation. Larry Trask was released from stasis with the other mutants, still shellshocked by what he had learned. [X-Men (1st series) #57-60]
Larry Trask became a house guest of Judge Chalmers for the next few years, living in a fog as the medallion suppressed his powers and his memories. Even the very idea of the Sentinels no longer rose to his conscious mind. It’s uncertain what exactly Chalmers expected for Trask’s future in this state, a point which became moot when Number Two and the Sentinels returned from the sun. They kidnapped Scarlet Witch of the Avengers, driving her brother Quicksilver into a frenzy to find her. Pietro recalled Trask and Chalmers and sought them out. The speedster wasn’t interested in Judge Chalmers’ concerns about Larry’s mental health and whisked him away for a private conversation.
Once Quicksilver removed Larry’s medallion, the memories and his mutant vision of the future quickly returned. Larry Trask confirmed the Sentinels had originally had two hidden bases, one in the Adirondacks and one in the Australian Outback. The Avenger commandeered a plane to fly them to Australia, but time seemed to be of the essence and a subsonic jet wouldn’t be enough. Quicksilver witnessed the Sentinel who kidnapped Wanda enter a space warp to teleport back to his base, a phenomenon the Sentinels hadn’t used before. At Pietro’s urgings, Larry Trask reached out with his mind and somehow connected with the space warp effect, opened a portal that brought them quickly to their destination.
[Note: Needless to say, absolutely no explanation was given for this. Either as a mechanical development or as Number Two's "mutant power", it makes no sense that Trask could mentally harness the space warps.]
As Trask and Pietro made their way to stop the Sentinels, Larry’s mind flooded with a series of brief images. He saw Number Two blasting the fallen Avengers, he saw a solar flare which destroyed the Earth, and then he saw blackness and nothing more. He could only assume this meant the utter destruction of all life on Earth. They realized that the Sentinels had concluded the best way to save mankind from mutantkind was to sterilize the species with solar radiation, 
preventing any future mutant births. Trask’s visions indicated the margin of error for controlling these solar flares would escape even the Sentinels’ control, ushering in doomsday.
At the Anthill base, Quicksilver spotted his fellow Avengers already engaged with the Sentinels outside. Larry Trask led them to a back entrance to avoid detection and reach Wanda and Number Two quicker. As Larry’s visions repeated, Quicksilver was injured defeating a Sentinel guard and he urged Trask forward without him. He saw his visions through a different lens as Number Two’s fatal blast was halted by the freed Scarlet Witch, and a computer model of a solar flare striking Earth proved to be the source of his second flash. Even though Earth didn’t appear to be in direct danger, the utter blackness remained a mystery.
Larry Trask watched from the shadows as the Avengers fought to remain ahead of the Sentinels’ adaptation protocols, but the longer the fight went on the more likely that the Sentinels would completely adapt to their powers and combat strategies. He spotted a mutant detecting alert system designed by his father and found it curious that the device was inactive. Piecing together some clues on a hunch, Larry reactivated the mutant detector so that every mutant in range was suddenly enveloped in a bright aura. This included Larry, Wanda… and Number Two. Somehow, 
the solar radiation from their trip to the sun had mutated Number Two enough that the Sentinel registered as a mutation. The Sentinel leader developed a space warp power unrelated to its circuitry, as well as an evolved intellect and independence capable of harming humans beyond its original programming. The other surviving Sentinels immediately turned on their mutant leader and destroyed him, only for their own programming to fail when their central governing unit died too.
The three Sentinels toppled where they stood and landed atop Larry Trask. The mutant who created robots to hunt mutants died instantly, perhaps even too fast to realize that his final vision of blackness was not the death of the Earth, but the death of just one man. [Avengers (1st series) #103-104]
Years passed, and the Sentinel program evolved many times. Steven Lang, Sebastian Shaw, Bastion, and many other parties used the Sentinels as mutant-hunting robots, to varying degrees of success. The Sentinel program always built atop the initial work of Bolivar and Larry Trask, meaning that their core command programming irrevocably contained the driving directive of "Destroy All Mutants".
During the Age of Krakoa, Charles Xavier (in his infinite compassion and wisdom) chose to revive 
Lawrence Trask using Krakoan resurrection protocols. Charles hoped that Larry could find a place in the new world as a Krakoan. However, Larry reported that the yoke from the Krakoan egg hadn't even dried before he started experiencing visions of Krakoa's fall, and the threat many mutants would pose to humanity once they were no longer held in check. He repaired the medallion to suppress his abilities and prepared for the future he saw coming. At some point before or after the Fall of Krakoa, Larry returned to Sioux Falls to reacquaint himself with the family business, Trask Capital, and was welcomed back by the board.
Mutants in America were hated and feared more than ever after Krakoa's demise. A federal program took possession of the Xavier mansion and renovated it as Graymalkin Prison, a containment facility for dangerous or unwanted mutants, beginning with Charles Xavier himself. Warden Corina Ellis naturally wanted her own Sentinel program, but tensions were high after Nimrod and the A.I. from Orchis nearly destroyed the Earth along with Krakoa. Larry Trask made contributions to Graymalkin and received a position overseeing the Sentinel program. He promised the people in charge a new brand of Sentinel tech to corral mutants without the risk of the killer robots turning on humanity.
Unfortunately, Trask actually lacked the ability to back up his claims. The "Destroy All Mutants" command code was so deeply-enmeshed in Sentinel programming, it would inevitably supercede any orders given by human controllers that tried to restrain or redirect the robots. Trask only wanted to apprehend and detain imminent mutant threats (as did the Graymalkin oversight committee... for now) and he refused to unleash unchecked killing machines. However, Trask discovered the existence of an anomaly. A Mark VI Sentinel was once severely damaged and recovered by a teenaged junkyard savant named Juston Seyfert. Somehow, in repairing this Unit, Juston was able to do what no one else could and reset Unit's core command. "Unit will never abandon Juston, no matter what" replaced "Destroy All Mutants!"
Juston was believed dead following Arcade's Murderworld massacre of Avengers Academy students, but his body was preserved by Unit. Using Mark VI nanotech, the Sentinel refused to let 
Juston die and instead maintained his lifesigns through cybernetic conversion. Larry Trask presumably discovered all this through one of his precognitive flashes, and he sought out Juston Seyfert. Larry experimented on Juston... for the greater good... and harvested the "Seyfert Strain" of Sentinel nanotech as the basis for a new, controllable Sentinel program. He kept Juston discreetly contained on Graymalkin property so he could extract new nanotech when necessary.
Sentinel Fireteam Alpha emerged as a squad of cybernetic soldiers serving Graymalkin Prison. Larry deliberately sought out wounded warriors from the Armed Forces who suffered severe injuries during the apocalyptic clashes between Marvels that seemed to happen every summer. With an infusion of cybernetic nanotech, these soldiers regained mobility, lost body parts or health, and the ability to serve their country.
However, the balance between man and machine was a work in progress. These Sentinels 
sometimes succumbed to "grafting," when the nanotech seemingly consumed their humanity. In fact, this was Juston attempting to call for help through the shared nanotech. Protocol was to execute soldiers who experienced grafting, as Trask claimed their humanity was irretrievable by that point, when he was actually covering up his own cutting corners to deliver on the product.
Despite the dark secret of the Sentinel program, it proved effective. Trask's Sentinel Fireteam Alpha managed to bring in legitimate threats like Omega Red and Sebastian Shaw. While grafting 
continued among the soldiers, they were considered expendible so long as mission protocols were successful. These successes allowed Larry to keep both Warden Ellis and Trask Capital at bay when they pressed him to fix the grafting issue or share the secrets of his new nanotech. Codename Shellback and at least one other Fireteam member was eliminated in the field due to grafting, leaving only a core roster of Lockstep, Sawtooth, Voivod and Drumfire. [Sentinels #1-2]
There were setbacks, though. Warden Ellis didn't trust Trask and was insistent on having more Sentinel options, and more controllable drones. The nanotech was introduced into dogs to create the Sentinel Wolfpack, cybernetic canine hunters. The control interface was still in the prototype stage, however, when a foolish Graymalkin scientist named Jerry Greentree took the initiative and sent them into the field. The Wolfpack attacked the Louisiana X-Men's new students, the Outliers, and a public setting at the New Orleans mall. It was a disaster as the Wolfpack were not only defeated, but the mutants emerged looking like heroes to the public. [Uncanny X-Men (6th series) #9-10]
The Fireteam's field success hit a snag when they pursued Fabian Cortez, only to lose him to 
Magneto himself. Voivod began grafting too and Lockstep refused to allow his execution. Captive and grafting, Voivod went far enough along in the process that Juston could actually communicate through him to Trask. The wagons started circling when Lockstep also went off-mission and murdered eight gangsters to free his ex-wife from a loan shark's debt. The Sentinel program was going off the rails, leaving Corina Ellis the opportunity to seize control. [Sentinels #3]
Scurvy, Graymalkin's psychic, got permission to poke around inside Larry's head and forced a confession. Meanwhile, Sawtooth freed Voivod from lockdown and they sought out Juston, calling to Voivod through the nanotech. Lockstep was reprogrammed for loyalty to Corina Ellis, but 
Voivod sacrificed himself to buy some time. Juston, Sawtooth, and Drumfire escaped from Graymalkin, bringing an end to the Trask Sentinel program. Ellis and Scurvy removed Larry's medallion and forced him to experience the full weight of his precognitive visions. He was left babbling to himself in the corner of one of Graymalkin's cells, a potential asset for the warden to exploit for her own future plans. [Sentinels #4-5]