[3] In 1988 he joined the Catalan performance group La Fura dels Baus and toured the world with them in their trilogy of spectacles Accions, Suz/O/Suz and Tier Mon.
[5] He was nominated for the Evening Standard Best Newcomer award for his portrayal of Ray in Simon Bennet's Drummers directed by Max Stafford-Clark at the New Ambassadors in London's West End.
He also played SS Colonel Karl Schoengarth in the multi-award-winning B.B.C./H.B.O film Conspiracy written by Loring Mandel and directed by Frank Pierson.
[10] He played Cardinal Sforza in The Borgias and was Commander Laurence Stern in Abi Morgan's award-winning The Hour for the BBC.
[11] Sullivan played antagonist Nyle Bellamy in the 2022 BBC adaptation of adventure novel Around the World in Eighty Days by Jules Verne.