Patrick was a genetically-engineered Human. Patrick's parents took him as a child to undergo an illegal procedure called accelerated critical neural pathway formation which dramatically increased his intelligence beyond what Humans would call genius level. However, the procedure also left him with a child-like personality.
Patrick was taken in to psychiatric care to live with others like himself. In 2374, when it was revealed that Doctor Julian Bashir had also undergone the same procedure, Doctor Karen Loews - the psychiatrist in charge of Patrick's case - took him, along with Jack, Lauren and Sarina Douglas to Deep Space 9. Dr. Loews believed that meeting someone like them who had managed to fit in to normal society would be helpful to them.
Along with the others, Patrick studied Gul Damar's speech calling for peace talks between the Dominion and the Federation. Together, just by watching the speech, they were able to determine the entire story of Damar's rise to power without ever having heard any of it before. Bashir was very impressed, and encouraged their thirst for knowledge about the Dominion. They asked to watch the holographic recordings of the peace talks, and determined that the Dominion was stalling for time to solve their shortages of ketracel-white. Had the Federation signed the peace treaty, they would have almost certainly lost the war.
Grateful to them, Starfleet provided Patrick and the others with classified reports and war plans. They quickly determined that the Dominion was certain to win the war and that the only way to prevent the loss of billions of lives was to surrender immediately. Unsurprisingly, Captain Benjamin Sisko rejected this immediately. Jack, Patrick and Lauren attempted to take Starfleet's classified information directly to the Dominion, knocking Bashir out and leaving him in Sarina's custody, so they could win the war more quickly, thus saving lives. Jack miscalculated, however, as Sarina released Bashir who then stopped him from meeting with Weyoun and Damar. Starfleet, however, remained willing to listen to any ideas they had on how to win the war. (DS9: "Statistical Probabilities")
In 2375, Patrick and the others developed a procedure that would cure Sarina of her inability to properly communicate with others. With Patrick posing as a Starfleet Admiral, they took her to Deep Space 9 where Bashir was able to perform the procedure successfully. Although possessing little knowledge of Starfleet regulations, Patrick was able to order officers around by answering every question with "That's a stupid question." (DS9: "Chrysalis")