Justin Paul Jonathan Allen

Founded in 1968, Proquest UK Holdings Ltd. is a holding company that operates subsidiaries which develop and market software for HR and accounting services. The company is based in Cambridge, UK.

Founded in 1973, Proquest Information & Learning Ltd. is a subsidiary of Cambium Learning Group, Inc. The company is based in Cambridge, UK. The British company supplies and publishes books and provides software development, human resource, and accounting services.

Part of Clarivate Plc, ProQuest European Holdings Ltd. is a holding British company that develops and distributes software and provides accounting services through its subsidiaries. The company is based in Cambridge, UK and was founded in 2013.

Part of Clarivate Plc, Pi2 Solutions Ltd. is a British company that provides product literature database systems for the biopharmaceutical industry. The company is based in Cambridge, UK. Founded in 2002. Pi2 Solutions was acquired by ProQuest LLC, part of Clarivate Plc from December 01, 2021 on May 01, 2014.

Founded in 1997, Ex Libris (UK) Ltd. is a British software development company that specializes in business and domestic software. Part of Clarivate Plc, the company is based in London, UK.