Half-Life Scientist

I was a scientist, I used to work in the Black Mesa Facility, After the resonance cascade happened I miraculously survived it, This person, his name was Gordon Freeman, He is 27 years old, from what I remember, He has a PhD in theoretical physics, he was assigned to the Anomalous Materials department in the Black Mesa Facility. I don't remember much about him other than that. The Resonance cascade occurred because we inserted a certain Xen crystal into the Anti-Mass Spectrometer.