his/her secretary; also, depending on context, your secretary (formal)
Allora, si faceva la sua segretaria?
So, was she his secretary?
— L'illusione perfetta - Now You See Me: Now You Don't (2025)
Tom ha chiesto a Mary di essere la sua segretaria.
Tom asked Mary to be his secretary.
Ho telefonato in ufficio ma ha risposto la sua segretaria.
I called the office but his secretary answered.