Hossein Zahir QC specialises in criminal defence work. He has represented defendants charged with murder, drug trafficking, fraud, money laundering and other serious crimes. He has a particular interest in terrorism and public order and protest cases.

Hossein is ranked for criminal law in Chambers UK 2019.

In the early 1990s Hossein spent a number of years working for the Newham Monitoring Project, an anti-racist campaigning organisation that provides legal advice and practical support to victims of racial violence and harassment in east London.

He qualified as a solicitor in 1998 having completed his training at Bindman and Partners solicitors. He then moved to Hickman and Rose solicitors where he qualified as a court and police station duty solicitor. In 2000 he moved to Birnberg Peirce and Partners solicitors where he qualified as a Higher Courts Advocate in 2003. He transferred to the Bar in 2005.