Dr. Philip Severin was a leading Confederation scientist involved in the research and development of advanced weapons. Throughout his career, he was involved in the development of high-energy explosives, demolitions, and warheads. Some of his designs were used against the Kilrathi during the Terran-Kilrathi War.
Some of Dr. Severin's experiments had severe consequences, with one of the most notable incidents occurring on Pax VII. In that incident, Dr. Severin was conducting a major demolitions test on the planet, during which he was assisted by Winston Chang. Dr. Severin neglected to warn the civilian population of the imminent test, and when the test went awry, millions of Paxon citizens were killed. The incident was quickly covered up by the Confederation and Pax VII quarantined, but Winston Chang was incensed by Severin's disregard for human life, and quit demolitions in protest to become a Confederation pilot instead.
Despite Dr Severin's questionable research and development practices, Dr. Severin was commissioned in the early 2660s to design a tectonic frequency weapon that was capable of destroying entire planets. It was to be part of the Special Operations Division's "long shot" effort to destroy the Kilrathi home world of Kilrah as a means to end the Terran-Kilrathi War. Severin spent the next ten years developing this weapon, later known as the Y22A-1 Temblor Bomb while top secret research on Kilrah's tectonic stability was conducted by Special Operations.
However, shortly before the project's completion, Dr. Severin was captured by the Kilrathi and imprisoned on the penal colony, Alcor V, halting the development of the Temblor Bomb. To make matters worse, by 2669 the Terran Confederation was on the brink of defeat by the Kilrathi, and their attempt to destroy Kilrah via the TCS Behemoth had ended in failure. Out of desperation, Brigadier General James Taggart of Special Operations ordered a rescue of Dr. Severin from Alcor V. The operation was to be carried out by Colonel Christopher Blair, who was stationed at the time on the TCS Victory.
During the rescue mission, Colonel Blair launched an assault on Alcor V's ground defenses, clearing a path for the Confederation Space Marines to rescue Dr. Severin. During their departure, Dr. Severin's former comrade Winston Chang physically assaulted Severin in revenge for the Pax VII tragedy. Dr. Severin was then extracted from Alcor V.
Dr. Severin and his team were eventually able to finish development of the Temblor Bomb, allowing the Confederation to use the weapon against Kilrah. The Temblor Bomb was successful in destroying Kilrah, effectively ending the Terran-Kilrathi War.