This accrual consists predominately of textual materials relating to John English's activities in federally-appointed positions after 1997. It also includes materials pertaining to his academic research and publication activities. The accrual contains research documentation and drafts of various articles, books and conference papers produced by Dr. English ca. 1979 to 1998.

In particular, it includes background research and publication information regarding his two-volume biography of Lester B. Pearson, which was published between 1989 and 1991 as The Life of Lester B. Pearson. In addition, a small volume of material relates to his activities as Member of Parliament including records of his Constituency and Parliamentary Offices.

The 2010 accrual consists of material relating to John English's personal and professional interests and activities from the early 1960's to 2010. Includes correspondence, manuscripts and research files, and records of organizations and political bodies in which he plays a role as well as University of Waterloo teaching files.

Includes 73 photographs, one audio cassette, 2 videocassettes, 1 audio compact disc.

The 2011 accrual consists of material relating to John English's personal and professional interests and activities from the early 1960's to 2010. Includes correspondence, manuscripts and research files, records of organizations and political bodies in which he plays a role as well as University of Waterloo teaching files.

The 2012 accrual consists of material relating to John English's personal and professional interests and activities from the early 1960's to 2011. Includes correspondence, manuscripts and research files, records of organizations and political bodies in which he plays/played a role as well as University of Waterloo administrative and teaching files.

The 2014 accrual consists of material relating to John English's personal and professional interests and activities from the late 1960's to 2009. Includes correspondence, manuscripts and research files, records of organizations and political bodies in which he plays/played a role as well as University of Waterloo teaching files.

Collection consists of material relating to William Lyon Mackenzie King from the estates of his brother Dougall Macdougall “Max” King and of his nephew (Dougall’s son) Arthur Macdougall King. Its major component is correspondence from Mackenzie King to Arthur King and also to Arthur’s wife Kathleen, over a period of twenty-seven years from 1923 to 1950.The first letter is dated 1923, a scant three years after the death of Max King, when Arthur and his twin brother Lyon were 10 years old and the last in the series is dated July 5, 1950. The collection also contains documents and ephemera relating to King’s death, funeral and will, received by Arthur King as a participant in those events; also present are issues of major Ontario newspapers that covered Mackenzie King's death and funeral as events unfolded day-by-day. A small selection of photographs, some formal and some snapshots, are also present. A selection of books retained by the family, among them works written and presented by John King and Dougall Macdougall King, also works owned by Mackenzie King as a boy, present a tangible reminder of the intellectual legacy of the King family.