Here is my sentence: "Julia's experience is similar to that of Robert's."
Would it be correct to put an apostrophe ('s) after Robert?
Here is my sentence: "Julia's experience is similar to that of Robert's."
Would it be correct to put an apostrophe ('s) after Robert?
Your sentence should be "Julia's experience is similar to that of Robert." If you were to say eg. "Julia's experience is similar to that of Robert's brother." then you would need the possessive apostrophe.
I'd say "Julia's experience is similar to Robert's".
If you include 'that of', no apostrophe should be used in my opinion.