Great answer. It's just a data point. There is no evidence that P(office manager, biomedical engineering) != P(office manager) * P(biomedical engineering).
I was a Production Manager at a Medical Device company here in the Bay area previously for almost 3 years. Wanted a change of scenery so I started helping Garry out.
From there, I started helping out with events and tech/ops at YC and joined the team to help out internally, officially (Tara and co have been doing so much already)! All I've got to say is I came for the experience, and stayed for the community.