Simeon was the second eldest son of Richard Simeon (died 1784) and Elizabeth Hutton. The third brother, Edward Simeon, was a director of the Bank of England. John Simeon married Rebecca Cornwall, daughter of John Cornwall of Hendon House in Middlesex, in 1783.
They had a number of children:.
1st United Kingdom Parliament. 3rd United Kingdom Parliament. 4th United Kingdom Parliament.
5th United Kingdom Parliament.
18th Parliament of Great Britain]
He also practised as barrister and a member of Lincoln"s Inn, and held the offices of Recorder of Reading 1779-1807 and Master in Chancery from 1795 until 1808 when he became Senior Master, and was created 1st Baronet Simeon in 1815.
