Mark's interest in organs began in the 1940s in rural Wiltshire where he lived with mother and piano. Early on he discovered the superb Victorian organs in local churches and he played for his first church service at the age of eight.  He was educated at Winchester College, Christ Church Oxford and the Royal College of Music.

After teaching music for a while he moved to Durham on April Fool's Day 1972 to join Harrison & Harrison. He arrived with his wife, Katherine, who retired recently after 20 years as Administrator of H&H. They have four children. Mark became Managing Director in 1975, and worked happily with Cuthbert Harrison until Cuthbert's death in 1991, when he also became Chairman. From 1994 to 2000 he was President of the International Society of Organ Builders. He is a Fellow of the Royal College of Organists, and still plays in public from time to time. 

Dr Christopher Batchelor succeeded Mark as Managing Director in 2011; Mark remains active as Chairman.