Sir Marcus Smith was called to the Bar in 1991 and took silk in 2010. He was appointed a chairman of the Competition Appeal Tribunal in 2009 and was the chair of the Appeals Committee of the Human Fertilisation and Embryology Authority between 2015 and 2017. He became a High Court Judge (Chancery Division) in January 2017, continuing to sit in the CAT, and also as a judge of the Financial List, the Patents Court and the Administrative Court. Between 2019 and 2021 he was the Chancery Supervising Judge for the Midlands, Western and Wales Circuits and between 2021 and 2024 he was President of the Competition Appeal Tribunal in addition to his role as a High Court Judge.

Sir Marcus Smith was called to the Bar in 1991 and took silk in 2010. He was appointed a chairman of the Competition Appeal Tribunal in 2009 and was the chair of the Appeals Committee of the Human Fertilisation and Embryology Authority between 2015 and 2017. He became a High Court Judge (Chancery Division) in January 2017, continuing to sit in the CAT, and also as a judge of the Financial List, the Patents Court and the Administrative Court. Between 2019 and 2021 he was the Chancery Supervising Judge for the Midlands, Western and Wales Circuits and between 2021 and 2024 he was President of the Competition Appeal Tribunal in addition to his role as a High Court Judge.