Sir Harry qualified and practised as a solicitor from 1960 until 1976.
In 1976 he jointly founded and was Chairman and Chief Executive of Hillsdown Holdings plc, which became one of the largest food groups in Europe with a turnover of over £3 billion and employing over 50,000 people.
Since Sir Harry resigned as Chairman of Hillsdown he has been involved in many businesses and charitable organisations and is currently a director and shareholder of a number of companies both public and private. Amongst other charitable initiatives in which Sir Harry is involved he is also the Deputy Chairman of the Portland Trust, Chairman of the UJIA Ashdown Board and a Trustee of the National Life Story Collection.
He is an Honorary Fellow of the Royal College of Physicians.
He was awarded his Knighthood in 1991 for services to the food industry.