Jonathan is a senior and co-founding partner of London law firm Quastels LLP, recognised by The Times in 2026 as a top 250 boutique law firm.
As a legal adviser to some of the UK’s largest family offices, private companies and entrepreneurs, Jonathan has around 30 years of commercial experience, with a background in complex commercial real estate transactions and a particular specialism in international structuring and investment. His practice today also focuses on wider strategic advice and business development.
A proportion of Jonathan’s practice is focused on inward investment into the UK from Continental Europe and the Middle East, particularly from Saudi Arabia, where Jonathan has strong connections.
In recent years, Jonathan has become more involved with the private wealth team in evaluating the legal aspects surrounding the use and protection of digital assets. Jonathan is particularly valued by his clients for his tactical and strategic advice in putting deals together and getting things done.
Before co-founding Quastels with David Quastel in 1998, Jonathan qualified as a solicitor and spent the first seven years of his career at Allen & Overy and subsequently SJ Berwin & Co. He has a degree in law from City Business School and from Trinity College, Cambridge. Jonathan is recommended in The Legal 500 2026.
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