It is possible that I missed your email. Feel free to send me a reminder if you didn't hear back after two weeks.
If you still didn't hear back, it is likely that I have read your email but cannot respond due to the high volume of inquiries. Check out this note to see if there are helpful information.
For urgent matters: Please consider cc'ing my admin's email at hadleyb@stanford.edu.

I am likely not able to reply to your inquiry about PhD applications due to the high volume of emails I receive.
Important: Stanford PhD programs are committee-based, so there is little we can do before your full application package gets reviewed.
For current Stanford PhD students: You can work with any professor in the university. If you are a PhD student at Stanford and interested in working with me, please contact me regardless of the program you are enrolled in.

I am actively looking for collaborations with other researchers in academia and industry. Please feel free to contact me if you are interested in collaborating on research projects.