Mark trained and practised as an architect prior to focusing on the unique relationship between light and architecture. He was honoured as a Royal Designer for Industry in 2012, and is currently serving as Master of the Faculty of Royal Designers for Industry until 2022.

Mark established Speirs Major, with Keith Bradshaw, who are recognised as being one of the world’s leading lighting designer practices, using light and darkness to enhance the experience of the visual environment.

He has led a wide range of award-winning lighting projects including the Millennium Dome, 30 St. Mary Axe, Beijing International Airport, the refurbishment of Royal Festival Hall and the re-lighting of the interior of St. Paul’s Cathedral. Recent award-winning projects include Gasholders London, The Macallan Distillery and Norwich Cathedral.

He is a specialist in the field of urban lighting and was named as a key city advisor by Monocle in 2013.