Jason is a barrister of the Supreme Court of New South Wales and High Court of Australia. Jason is the recipient of the Bachelor of Arts (Macq) (2006) and Bachelor of Laws (LLB) (Hons 1) (UWS) (2009) degrees and Graduate Diploma of Legal Practice (COL) (2009). Jason graduated with the University Medal in his LLB degree at UWS. Jason was admitted as a lawyer to the Supreme Court of New South Wales on 2 July 2009. Jason has substantial legal experience. Jason has worked as a researcher to Professor Michael Adams (Dean of Law at UWS) (2008) and the Honourable Michael Kirby AC CMG (former Justice of the High Court of Australia) (2009-2010), Tipstaff to the Honourable Justice Peter McClellan AM QC (former Chief Judge at Common Law of the Supreme Court of New South Wales) (2010) and a lecturer-in-law at UWS (2009-). Jason has a strong concern for social justice and equality.

On 10 October 2024, Dr. Donnelly was appointed as a General Member of the Commonwealth Administrative Review Tribunal.

A more comprehensive biography of Jason can be found on his website at www.jdbarrister.com.au.