Recruited into the Bureau after studying psychology at Oxford, Mulder showed an inclination toward the off beat from the beginning of his career. His early monograph on serial killers and the occult led to the capture of a notorious murderer.
M.F. Luder Wrote article in "Omni" about the Gulf Breeze sighting
George Hale When seperated from Scully, used to contact her.
Reynard Muldrake Jose Chung. Reynard means Fox
Marty Mulder In "3" for contacting blood banks
Mr. Kaplan In "Pine Bluff Variant" when staying in motel undercover
Mulder's date of birth (in "Paper Clip") is October 13 1961 In "Ususual Suspects", we see Mulder's file which says he was at Oxford between 1983 and 1986. Mulder tells Scully in the "Pilot" that he went to Oxford as soon as he could leave home. In "Ususual Suspects" we see that Mulder was at Quantico in 1986. (the Quantico course is 4 months long) In Dreamland II we see that Mulder joined the FBI on 24th October 1986. It's not clear if this is the date he graduated from Quantico, or the date he started his course. in "Pilot" Scully mentions the monograph Mulder wrote in 1988, which caught Monty Props.
In Tooms, Mulder says he worked profiling serial killers for three years. Roche, seen in "Paper Hearts", was profiled in 1990.
The "Pilot" episode is dated March 1992, in which Mulder is said to have started working the X-Files "recently".
Starting The X-Files
In May 1989 (Unusual Suspects) Mulder was a normal FBI agent, until he was sprayed with an experimental drug thatcaused hallucinations and paranoia. He started raving about aliens. At this point he had never thought about conspiracies and things, hence his incredulous "what?" as Byers begins to tell his tale.
The following month he underwent hypnotic regression to find out what happened to Samantha, suggesting there is some relationship between the two. The X-Files themselves seem not to have been opened until the end of 1991, suggesting that Mulder has a good 2 years as an agent in Violent Crimes, working on his paranormal theories in his spare time, and, perhaps, getting more and more impatient with his work and nagging on and on to be freed up to investiagate what he really wanted to.
("Kill Switch" says that Mulder started the X-Files in 1990, but this contradicts both "Musings of a CSM" (the opening of the X-Files is discussed as a new and recent problem at the end of 1991) and the Pilot episode itself when Scully is assigned in March 1992, with Mulder's obtaining of the X-Files again described as "recent".)
At the time he started the X-Files, in 1991, he had a girlfriend called Diana Fowley, who was an FBI agent with knowledge about, and belief in, parapsychology. They did a few cases together. She later went abroad after they split up.