Is it legal for a university student to tape record a meeting with his professor when he is threatening for damaging the student's future career?

The legality of recording a meeting with a professor without their consent varies by jurisdiction. In many places, it is legal to record conversations if at least one party consents, which could include the student. However, in some states, all parties must consent to the recording for it to be legal. It's important for the student to check local laws and university policies regarding recordings before proceeding.