The Baby Harp album was inspired by his hospital sessions with families at Great Ormond Street Children's Hospital and other children's wards around London.
Mark specialises in a contemporary style, arranging songs from the 50s to present day. Sets can (and often do) include harped up versions of everything from Metallica to Mary Poppins.
His live credits range from Royal receptions at St James Palace to sunrise sets at Glastonbury Festival.
You can see more videos and find out more about his work below:
(He also writes about himself in the 3rd person in music biogs)