[1] Horrocks began his library career in Manchester, England, from 1945-53 interrupted by three years in the British Army's Intelligence Corps between 1945 and 1948.
[1] He was elected a Fellow of the Library Association, and worked in Cyprus and Perth (where he obtained a bachelor's degree in constitutional history),[1] and then studied for his MLS and doctorate at the University of Pittsburgh before joining Dalhousie in 1971.
He left in 1986 to become Editorial Vice President of Scarecrow Press,[1] a leading reference book publisher in Metuchen, NJ, until he returned to Dalhousie in 1995.
[2] Horrocks was honored with the Joseph W. Lippincott Award by the American Library Association in 1995.
In 2004 DHorrocks was awarded the International Kaula Gold Medal, having earlier become the only person to have been elected to Honorary Membership in the three national library Associations—Canadian, British and American.