My lad met him when Prof Cox picked up some award at the uni, just after both my kids saw his last “arena” tour.
Jnr was sorting out the AV for the ceremony, and Brian Cox asked him how it was going – Jnr said something about more straightforward than your tour show, they got chatting, Brian asked him what he was studying and when Jnr said it was music they had a 15 minute conversation about the logistics of doing the arena tour with a live orchestra at Sydney Opera House, and kept everyone else waiting.
He seems a sound bloke, possibly because iirc he had to go to uni as a mature student as he didn’t get the grades? Though possibly an excuse for the D:ream years.