Admitted a scholar to St. John's College in 1551; apprenticed to a London haberdasher and became a wealthy merchant; a "Customer of the Queen" at Visitation of London 1568 when he is described as "3 sonne of William Billingsley, of London, Citizen & haberdasher." Translated Euclid with notes and published same in 1570; chosen Sheriff of London in 1584; an Alderman in LowerWard 16 November 1585; registered admission to Grey's Inn 22 February 1590-91; moved to Candlestick Ard in 1592; President of St. Thomas Hospital 1594-1606; elected Mayor of London 31 December 1596; knighted 6 February 1596/97. Sat as a member of Parliament for London 19 March 1603-4. He was granted large estates in Irelend by Elizabeth. He died 22 November 1606 and is buried in church of St. Catherine