The doctors whom you work with *in/at* the same hospital // ...*in/at* the same university... 1. The doctors whom you work with *in/at* the same hospital were arrested for corruption. →Is this sentence correct? Between "in" and "at", which preposition is better here? Or are the both correct? 2. John, whom you studied with *in/at* the same university, was promoted to the manager of the company. →Is this sentence correct? Between "in" and "at", which preposition is better here? Or are the both correct? Thanks!