I'm confused about using "has" or "have" after "who". For example:
- I am a doctor who have confusion in using has or Have.
- I am a engineer who has 4 year experience, degree in engineering and is available.
Will it vary depending on I or Who?
The verb after who should match the object before who. (In the sentence structure you use, the subject [I/We] is independent of the object [professor/professors]):
To quickly double-check your verb choice, simply remove the subject, predicate, and the who, and make sure it reads correctly:
In both your examples, the correct answer is has.
The word has refers to the doctor or engineer, not to I.