This post is spot on.
When I talk with people in technology, it’s frequently assumed that I don’t belong. People ask me “are you a recruiter?” with alarming frequency. People will ask me if I’m at a technical event because my boyfriend is. It’s not uncommon for someone to say “but you don’t look like an engineer” or give me the look that says exactly the same thing. I haven’t been mistaken for a janitor, but nearly half of black and Latina women in science have.
It was a delight that this didn’t ever happen at HBS. At HBS, a common first question is “what section are you in?” – assuming you are a student. No one ever asks me “are you a partner?”
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more on Ellen Chisa's blog. I can't even being to count how many times this has happened to me. "But you don't look like..." [someone who works in PE, in a petroleum refinery, as a software engineer].