Mmm, I don't think so because I would try to talk to him, and then run and grab Veronica where I had her waiting, and then he'd talk to her and me. But to be sure I'd have to go back and do it again. Let me know if it works!
He talked
after completing Veronica's quest? I went with Veronica to Hidden Valley after starting her quest, and Veronica talked to McNamara. But after their conversation, McNamara didn't talk with me.
I'm having the same issue, both of the people wouldn't talk. I found Veronica but the side quest did not start for me. I have been to all of the locations where Veronica's quest gets triggered but I had no luck.
Pretty strange, in my game she started the quest just visiting Madrid Apartments and Vault 3. Remember that to start the quest you need to talk with her every time after she says her sentence about the brotherhood.