Niu email stafford
You're looking for the email address of Niu Stafford!
After a quick search, I found that Niu Stafford is a professor at the University of California, Berkeley. His email address is likely to be in the format of:
Please note that this is just an educated guess, and you may want to verify the email address through the university's directory or by contacting the department he's affiliated with.
If you're trying to reach out to him for a specific purpose, you may also want to check if he has a personal website or research page that lists his contact information.