Why would a professor not reply? A professor has offered me a summer research project at his lab. The last we had talked was on a Zoom call during which I was offered the position. He had then asked me to send my academic records after which he would give the other documents like Offer Letter, Visa Forms, etc. I have mailed him my records and have asked to discuss the project dates. He is not responding to my emails. It's been almost 20 days. I have also sent follow-ups, the last one being sent this Monday. He still hasn't responded.
Has he cancelled my project? If so, why hasn't he informed? What should I do next? Should I send another follow up this Monday?
Given that the 20 or so days covers holiday periods there might be a simple answer. The professor might be traveling. Might even be sick, given the pandemic. You can follow up if you like, but keep it polite. If you have access to the department email address, you could ask them if there is a reason that they might not be replying.
Don't jump to conclusions, but follow up with other options that you have.