Mark Colbert Kelly (born 9 April 1961) is an Irish keyboardist and member of the neo-progressive rock band Marillion. He was raised in Ireland until he moved to England with his parents in 1969. Kelly was an electronics student while performing part-time in the progressive/psychedelic band Chemical Alice, who released their EP Curiouser and Curiouser in 1981. He was invited to join Marillion when they supported Chemical Alice, replacing previous keyboardist Brian Jelliman. His first performance with the band was at the Great Northern at Cambridge on 1 December 1981. He has appeared on every Marillion studio album. Kelly also appeared on John Wesley's album Under the Red and White Sky in 1994 and on Jump's album Myth of Independence in 1995 on production and keyboards.