There is often a question asked about I/me or he/him in the construction "He is taller than I/me" or "I will arrive earlier than he/him."
The word than begins a dependent clause and is always involved in a comparison. Often a dependent clause can have some vital parts missing; that is, the subject and/or the verb can be missing. It is still a clause, however.
The way to tell the correct form for these pronouns in these clauses is to put everything back into the clause.
...He is taller than I (am tall).
..I will arrive earlier than he (will arrive).
So in these two clauses the choice is the nominative form, I and he.
Happy punctuating.
Margie