Leo

I'll take this from a recruiting perspective.

I'm enough of a realist to know that hiring managers will make judgments (for/against/indifferent) on long hair the moment you walk through the door for an interview.

And I'm enough of an idealist to think that if you have to adjust to fit in to the point where you feel you're compromising who you are as a person, then it's the wrong workplace for you.

Depending on what research you read, most inexperienced recruiters sum up a candidate in the first 4 minutes (some suggest it's a matter of seconds, but I'm not convinced of this, either way it's a short time and usually when the recruiter is at their most alert and the candidate is at their worst) and the recruiter spends the rest of the interview 'editing' what they're hearing to confirm their initial judgment. Psychs refer to this as the 'halos and horns' effect. In this case, if the recruiter doesn't like long hair, it's pretty unlikely you'll get the job. But you have to ask yourself; 'if that's the case, is this a place I want to work'?

Then again, you have to ask yourself; 'is it really that important to me'?