That's my advice to new attorneys.
Also, open your office door. And, once in a while, around lunchtime, find an attorney that looks approachable and seems to know what they're doing and say, "Hey, what are you doing for lunch?"
(I'm not saying you should buy them lunch. Although I'm sure they'd appreciate it. Or ask them on a date. Which they may or may not appreciate, depending on the circumstances, I guess. But you could just grab a slice of pizza, no big deal. Hey, maybe they'll even buy you lunch! Or you could just bring your sandwich in her office while she eats her crappy lean cuisine meal and wishes she had your delicious sandwich and you can chat about your cases or what's been going on in the office.)
But this isn't about lunch.
There's a new attorney in my office who walks around with headphones in his ears constantly (except in court, of course). And every time I see him, I just think, "God, he's probably missing out on so much."
Maybe guys are less likely to feel lost. Or maybe they're less likely to let on.
And I'm not saying that you have to be super-outgoing. But when I was new, I learned so much by seeing a colleague in the morning and saying, "Hey, are you walking to court? I'll walk with you," and chatting during the walk. Or, if I didn't feel like talking in the morning, just listening.
Or, sitting down next to a colleague in the courtroom and discussing (very quietly, of course) what book you're reading or what's up with the judge's hair. And not just public defenders, you can chat with private counsel, or co-counsel.
I've made friends with other attorneys just by saying "Good morning!" every morning. Or, you know, just making small talk. Which turns into, "Hey, I saw that case you stood on today in court, I tried a case sort of like that..." As we've gotten to know each other better, these attorneys have offered help to me ("Do you want to see my trial file for that case?") and have offered to let me help them ("I have a trial coming up, want to second seat me?").
But I'm not saying that you should be more outgoing just to further your career. Although, that's a good thing.
I think it's also good just for general job happiness - to get to know people, to make friends, to just get general fun information (like, that the bathroom is out of order, or about the judge's new hairdo, or who's sleeping with who, or whatever). And who doesn't want to know that kind of thing?
So, take your headphones off. You might just learn something.