Peter William Noonan was born in Windsor Ontario and graduated from Marlborough Public School, Belle River District High School, and the University of Windsor. He received his Bachelor of Laws degree in 1979 and was subsequently called to the Bar of Her Majesty's Courts in Ontario in April 1981. Later that year he joined the Public Service of Canada as a legal counsel and he spent the next thirty years in the practice of public law with the Government of Canada. He appeared before government tribunals and in the Federal Court, the Federal Court of Appeal, and the Supreme Court of Canada. The author retired from the Department of Justice in 2011 and was subsequently appointed a Member of the Ontario Energy Board until 2015. Through his professional work the author developed a strong research interest in the constitutional role of the Crown in Canada. From 1996-1998 he researched, prepared, and published the first edition of The Crown and Constitutional Law in Canada. Between 1998-2000 he held an appointment as a Sessional Instructor in Crown Law in the Faculty of Law of the University of Calgary. He received a grant of arms from the Canadian Crown in 2015 at a ceremony conducted by the Chief Herald of Canada, and the Saguenay Herald, at the Chancellery of Honours in Ottawa.