Mark started at Sporting Pictures agency in Central London as a darkroom junior at sixteen years old, with an obsession for football but without ever having owned or used a camera.
He started going to matches with other photographers as a film runner, whilst learning the trade on the side by sneaking in a camera to take his own pictures. Within a year he was covering the European Cup Final in Paris.
By 1977, Leech had moved on to start up the agency that would later become Offside Sports Photography. During his career he's covered seven FIFA World Cup tournaments, numerous cricket tests and three Rugby World Cups but now concentrates solely on football photography.
In 2012 he was awarded the prestigious Barclays Photographer of the 20 Seasons, for his folio of Premier League football pictures.
Ruud Gullit - Netherlands v USSR - 1988
Wayne Rooney - England v Switzerland - 2004
Trevor Francis - England v Scotland - 1981
Paul Gascoigne kisses the hand of Princess Diana 1991 - Wembley
Glenn Hoddle shoots - 1984 - Tottenham Hotspur v Ipswich Town
Thierry Henry of Arsenal - Final Game at Highbury - 2006
Ossie Ardiles 1980 - Tottenham Hotspur v Arsenal
Lionel Messi - Champions League Final - 2011
Ian Botham - Herts v Somerset - 1984
Ian Wright - Crystal Palace - 1989
Totti penalty - Italy v Netherlands - 2000
The England Team walk out - EURO 2000
Sella and Webb - France v England - RWC 1991
Sunday Morning Football - Burgess Park - 1997
Brian Clough and Peter Taylor - 1978
England Rugby - France v England - 1996
Ian Botham - England v Australia - 1985
Brian Moore carried by fans - England v Wales - 1992