Diana is a well-known patent litigator, working particularly in life sciences with an international practice in that area. As well as acting in patent disputes in all UK courts, she advises on international disputes and coordinates and assists with actions in other jurisdictions and patent offices. Diana graduated from the University of Sussex with a degree in mathematics, statistics and economics. After a period with the civil service, she retrained as a solicitor. On qualification, Diana joined the central London commercial firm of Stringer Saul. She managed that practice for three years until 2001 when she joined Rouse.