John Nash was educated at Corpus Christi College, Oxford where he read law and then became a barrister. He practiced briefly and then went into the City. He worked at Lazards for 8 years and became an Assistant Director and then left in 1983 to go into the venture capital business joining Advent Limited, of which he became Managing Director in 1987.
In 1988 John set up Sovereign Capital, a venture capital firm which specialises in investing in service businesses in the UK. John is a former Chairman of the British Venture Capital Association and also Chairman of Future, a charity he and his wife, Caroline, established to focus on young people which supports a number of inner-city projects and sponsors Pimlico Academy.