[citation needed] Montgomery was called to the Bar in 1980 and was made Queen's Counsel in 1996.
[1] She undertook pupillage at 2 Gray's Inn Square with Peter Leighton, Keith Knight and Charles Welchman.
She received a Senior Award from Gray's Inn (1980) and became a Master of the Bench in 2002.
Montgomery's profile on the Matrix Chambers website describes her as a "specialist in criminal, regulatory and fraud law, perhaps best known for her work on legally and factually complex cases.".
[2] The British press have reported on her being involved as an adviser to Prince Andrew in relation to FBI enquiries in the Epstein/Maxwell affair; in so doing, papers including the Times and Telegraph have pointed out that she had (in 1998) also assisted General Pinochet in defending extradition proceedings.