Dhir practised as a barrister for 23 years, as counsel for both prosecution and defence for serious criminal cases as well as those involving national security and human rights.
Previously a member of various Bar Council Committees including the Equality Committee, the Professional Conduct Committee and Law Reform Committee, Dhir has been heavily involved in advocacy training in the UK and abroad: she was head of teacher training for Gray's Inn and has led training in India, Sri Lanka, Jamaica (death row cases), Bermuda, Bhutan, Malaysia, Singapore (for the AG), Zimbabwe and South Africa.[4]
Elected a Bencher of Gray's Inn in 2009, she also took silk and was appointed Recorder,[5] before promotion as a Circuit Judge in 2012. In February 2017, at the age of 49, Dhir became a Judge at the Old Bailey.[4][6] Since 2015, she has been a tutor judge at the Judicial College.[6]
In November 2018 she made the headlines after sentencing an 18 year-old youth, who had threatened a motorist with a knife, already with a previous conviction for robbery with a knife, to a suspended sentence of imprisonment.[7]