Well, Takeo knows him which probably implies Takeo himself is some sort of military guy, but that's it.
Either he's dead and that's the reason why Misato became this... person she is now, or we'll see him in "Final" in that "place of hope".
But if he's alive, it's hard to think that he wouldn't be affilated with WILLE somehow, maybe he's the keeper of their base, or he's the leader of a human colony.
Him being dead seems like the most likely option, though.
Mostly because it explains Misato.
I mean, can you see her becoming corrupted and cold if she was in happy relationship with her highshool sweatheart? Because they seemed as good as back together by the time Bardiel rolled around, so something must have... stopped them.
He seemed very much alive during TI itself, but maybe the struggles afterwards killed him. Maybe he was killed in the events surrounding the defection of Misato & co from NERV.
Make Clone Love Not Clone War