Research Director not responding to email - should I call him?
Before you call him, email the department receptionists and ask if the Research Director is around. It's possible he's on holiday, he's on bereavement leave or paternity leave, he's attending a conference, and so on. The department receptionists are likely to be more familiar with his schedule than most. If they say he's around, you can also ask them to pass a message to the Research Director.