Mark is an English actor who was born in Rotterdam on the 23rd August to British parents Jill Cornelius, a nurse from Coventry, and Andy Jackson, an engineer from Birkenhead. He also has a younger sister, Danielle, who works as an environmental professional. He was educated at The Birkenhead School and The British School Of The Netherlands. Later he read English Literature and Drama at The University of East Anglia and then trained at the prestigious Bristol Old Vic Theatre School. Mark plays series regular Isaac in The Orville (2017) for Twentieth Century Fox Television and Fuzzy Door Productions opposite Seth MacFarlane, Adrianne Palicki, Scott Grimes, Halston Sage, J. Lee, Peter Macon and Penny Johnson Jerald. His extensive stage credits include appearing with Celia Imrie and Robert Glenister in the award-winning Noises Off at London's Old Vic Theatre, the international tour of One Man Two Guvnors with Rufus Hound, performing opposite Robert Powell in Agatha Christie's Black Coffee and playing Captain Stewart in the National Theatre's acclaimed production of War Horse by Michael Morpurgo at the New London Theatre in London's West End.