I think that Dr. Rosen could possibly be Gary's father, here's why:
- The way that Dr. Rosen and Gary's mother interact. When he picks Gary up it's like a father picking up his child for weekend custody, they speak briefly and he calls her by her first name.
- The amount of trust Gary's mom gives Dr. Rosen (letting him stay at his office, allowing him to continue on working even though he's been injured, abducted, and had a chip planted in his neck!)
- They are both the right age, mid-50's.
- We don't know who Gary's father is or who Dr. Rosen's wife/ex-wife is.
I think I have all my facts right, correct me if I'm wrong.
What do you think?