Joe is a security guard in Jeremy Fitzgerald's building who allows Daniel and Natasha to go on the roof. He spent his life making plans to travel and fully enjoy retirement with his wife, and was devastated when she died mere months into their retirement. He smokes cigarettes and overworks himself to cope with his grief.
Joe/The Security Guard Character Timeline in The Sun is Also a Star
The timeline below shows where the character Joe/The Security Guard appears in The Sun is Also a Star. The colored dots and icons indicate which themes are associated with that appearance.
...there's no roof access. Daniel says "open sesame" and miraculously, the door opens. It's a security guard who reeks of cigarette smoke. Daniel pleads with him to let them on the roof,... (full context)