What is the best way to schedule an office hour appointment with big name professor? What is the best way to schedule an office hour appointment with big-name professor?


Directly email him.
Email his secretary, asking for an appointment.
Talk in person causally first and ask his preference (if possible).


I am in a school where some professors do not have a regular office hour, and occasionally, my email is ignored (or replied three weeks later) even if the email is short. Almost all of them have a secretary, who knows the professor’s schedule completely.
By all means, contact the admin assistant and be extra super nice and polite because they have more power than you might think. Even if they don't schedule appointments, they'll know the best way to reach him.