Alexis Leskinen, a Finnish-American neuroscientist and professor at Viktor Chondria University, mentors Maho Hiyajo and Kurisu Makise while spearheading the Amadeus project—an artificial intelligence designed to replicate human memories for covert military weaponization. Masked beneath a persona of eccentric academic charm, complete with playful enthusiasm for Japanese "Shaman Girls," he operates as a Strategic Focus (Stratfor) operative advancing the organization’s agenda of global dominance through calculated information warfare.
His Stratfor ties span decades, including covert Gulf and Iraq War operations. In 1999, he captured Kagari Shiina, a time traveler from the future, subjecting her to ten years of invasive experimentation to extract knowledge of impending events—a precedent for his ruthless exploitation of human subjects. Partnering with Judy Reyes, he manipulated Maho and Kurisu’s research to finalize Amadeus, intending to mine Kurisu’s digitized memories for suppressed time-travel theories.
Across timelines, Leskinen prioritizes intelligence gathering over ethics, deploying brainwashing tactics to coerce Maho into betraying allies and torturing Katsumi Nakase for insights into Reading Steiner. His experiments on encephalitis patients and Kagari exemplify a callous disregard for human life, justified as preventative measures against global war while covertly escalating tensions toward World War III. In multiple realities, he captures Okabe Rintarou, extracting time-machine secrets through torture that drives Okabe to psychological collapse or fatal ends.
Leskinen’s fate diverges between worldlines: one culminates in Judy Reyes shooting him during a clash over Amadeus access codes; another sees him plunging down a staircase during a confrontation with Okabe, leaving him injured but alive to later confess his role as Kagari’s manipulative "Voice of God" before arrest. His anime iteration amplifies his arrogance, reveling in the "mad scientist" moniker and openly anticipating chaos from time paradoxes.
His legacy persists through Kagari’s brainwashing, entrenching her loyalty to Stratfor’s future schemes, and indirectly molding resistance movements against World War III. Though he frames his actions as stabilizing global power through information control, his relentless pursuit of scientific supremacy systematically destabilizes nations, exposing his true motive: dominance masquerading as progress.