Like you, I work in a white collar job and I'll tell you that I've not had one single problem about my beard at work, even in its current state. I think that as long as you look neat, especially if you're in academia, you'll be fine. I also think it's easier for, um, more mature (read older) guys like us to pull off a bigger beard in this environment than it may be for younger men. Something about the grey makes it more acceptable.

Just hang in there, man!
Tom


Some helpful links:
Library Central of Beard Growing


Taming the Wild Mustache
Tips for eating and drinking with a big mustache

Excess on occasion is exhilarating. It prevents moderation from acquiring the deadening effect of a habit. ~ W. Somerset Maugham
A jerk with a beard is just a bearded jerk, but a bearded gentleman is awesomeness personified. ~ Triibeard