I am going to apply for a postdoc call and I have commenced exchanging emails with a professor. In his first reply to my initial email he addressed me with my first name (Dear (my first name)). In my second email I address him as

Dear Professor (His first name only)

and his reply on my second email was

Dear Colleague.

Now I do not know whether I can address him with his first name without using the word "professor"?

  • probable duplicate of academia.stackexchange.com/q/84410/75368
    – Buffy
    Aug 6, 2021 at 12:13
  • In the US, addressing a professor as "Professor Tony" (their first name) is extremely weird. I suggest you keep it formal until you meet them personally.
    – Buffy
    Aug 6, 2021 at 12:14
  • @Buffy Many Thanks for informing me about the above links, they are extremely useful. I am sorry for not searching a lot and mentioning duplicated question.
    – user40491
    Aug 6, 2021 at 12:19
  • 1
    A bit of warning. While it isn't especially polite or sensible, addressing those perceived as "underlings" by their first name is pretty common. But people who do that may not appreciate a symmetric addressing by those they consider underlings. Hence, I suggest formality until you have explicit permission. "Professor Smythe" (family name) is always safe. "Professor Tony" or "Tony" can be read (probably unfairly) as presumptuous. If you weren't seeking something from them it would probably not matter. But here, it might. Note that many people never address their parents by first name.
    – Buffy
    Aug 6, 2021 at 12:29
  • In formal correspondence, including during the application process for a position, address faculty in emails with "Dear Professor [Last Name]." Even if they sign an email with their first name use Professor [Last Name]. Only use their first name if they explicitly tell you to use their first name. Aug 6, 2021 at 18:50