[cobychapple]

We don't assume anything. New employees here at GitHub can choose whichever platform they prefer—it just so happens that most people here go for Macs of their own accord :)

[bti]

Out of curiosity, how many developers do you have who primarily use a Windows machine?

[holman]

One. The rest of the Windows team virtualizes on a Mac.

[troygoode]

I'm guessing the one is Phil Haack

[ymendel]

Nope, Markus Olsson.