Lady Justice King was called to the Bar at Inner Temple in 1979. She was appointed as a QC in 1999. She was made a Bencher of Inner Temple in 2008.
In 2008, Lady Justice King was appointed to the High Court within the Family Division and was the Family Division Liaison Judge, firstly to the Northern Circuit and then the Midland Circuit from 2010 to 2014.
In October 2014, she was appointed as a Lady Justice of Appeal.