Jonathan lives in Lindfield with his wife Jacqueline and their four children. He is actively involved with local church, school, sporting, charity and other community groups.

Jonathan was educated at St Aloysius' College and St Ignatius' College. He has two Bachelor degrees (Arts & Law) and two Masters degrees (Law & MBA).

During his studies Jonathan was Vice-President of the Sydney University Student Representative Council and a Mitsui Foundation Scholarship winner.

Jonathan worked as a solicitor in private and corporate practice for 5 years before moving into commercial and management roles. He has run various niche financial services businesses as a senior executive or General Manager and was a non-executive board director with the private health insurer HCF for 14 years.

In addition to his commercial and management roles, Jonathan is a past North Sydney Local Government Councillor and Deputy Convenor of the Australian Classification Review Board. He has also provided honorary service on other not-for-profit boards.

At the NSW election on 24 March 2007, Jonathan was elected as the Member for Davidson. He was soon appointed to the Committee on the Independent Commission Against Corruption and later served as Opposition WasteWatch Co-ordinator. On 26 March 2011 Jonathan was re-elected as the Member for Davidson as part of a new Liberals-Nationals Government and served as Chair of the Public Accounts Committee. On 28 March 2015 Jonathan was again elected to represent the seat of Davidson and was appointed Parliamentary Secretary for Major Events and Tourism. In April 2016 he was also appointed the Parliamentary Secretary for Trade and Investment. In January 2017 his role changed to become the Parliamentary Secretary to the Premier and Treasurer.