Called to the Bar at Gray's Inn in 1989,[6][7] Cheema-Grubb, in 2006, became the first Asian woman to be appointed a Junior Treasury Counsel.[4] In 2007, she was promoted Recorder.
In 2013, Cheema-Grubb took silk (QC)[6] serving as Senior Treasury Counsel before receiving authorisation to sit as a deputy High Court judge.[6] She chaired an Advocacy Training Council working group which produced the report "Raising the Bar: The Handling of Vulnerable Witnesses, Victims and Defendants in Court".[8]
Cheema-Grubb successfully acted for the prosecution against retired Anglican Bishop Peter Ball for sexual abuse[9] and against barrister and Recorder Constance Briscoe for perverting the course of justice.[10]