Full Name: Fox William Mulder
FBI Badge Number: JTT047101111
Date of Birth: October 13th, 1961
Height: 6'
Weight: 170 pounds
Hair: Brown
Eyes: Hazel
Marital Status: Unmarried
Current Address: 2630 Hegal Place, Apt. #42, Alexandria, Virginia.
Father: William Mulder (Assassinated)
Mother: Teena Mulder
Siblings: Younger sister Samantha Ann Mulder, born January 22nd, 1964. Disappeared November 27, 1973, at age 9.
Education: Oxford University, A.B. in Psychology, 1982. Quantico FBI Training Academy, 1984.
Email address: F_Mulder@FBI.gov
Current whereabouts: Back from the DEAD!

In his own words:

I'm the key figure in and ongoing government conspiracy, the plot to conceal the truth about the existance of extraterrestrials. It a global conspiracy really, with key players in the highest positions of power and it reaches down into the lives of every man, woman, and child on this planet. So of course no one believes me. I'm an annoyance to my superiors, a joke to my peers. They call me Spooky, Spooky Mulder whose sister was abducted by aliens when he was just a kid and now chases after little green men with a badge and a gun shouting to the heaven and to anyone who will listen that the fix is in, that the sky is falling, and when it hits is gonna be the biggest shit storm of all time...

What the military/entertainment complex would have us believe*:

Be sure to watch for partial truths meant to hide the lies.

Special Agent Fox "Spooky" Mulder was on a fast track in the FBI when he took a detour into the paranormal. Convinced through hypnotic regression that his sister was abducted by some unknown power when they were children, he is now obsessed with discovering the truths hidden in the X-Files, a repository for the extraordinary, the unexplained and the supernatural. 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. But far from pursuing what could have been a stellar career within the Bureau, Mulder chose "the basement office with no heat" where the FBI hides the X-Files. Only his network of contacts in Congress and other halls of power has allowed him to continue his investigations in the face of official indifference and covert opposition. Opposed by enemies within the Bureau itself and beyond, the only person he can trust absolutely is his partner, Dana Scully.

*This came from the "official" X-Files web site. Beware the source.