Callum Henderson-Begg

Ludicorp Research & Development Ltd. operates an online photo sharing website - Flickr. It provides online digital photo management services that allow users to store, search, sort, and share pictures from digital cameras or camera phones. The company was founded by Stewart Butterfield in 2002 and is headquartered in Vancouver, Canada.

Part of Ascential Plc, Ascential UK Holdings Ltd. is a business-to-business media company based in London, UK. The British company connects influential people and organizations to a high-value network of decision-makers, data, and ideas. The company offers a new training and development program for their employees to help further their professional careers. The company encourages their employees to identify respective areas of development to meet the ever-changing demands and priorities of the workplace. Founded in 1954, the company owns a focused portfolio of market-leading events and brands such as Property Week, AV Magazine, Electronics Weekly, Digital Refining and Decarbonisation Technology, Drapers, Retail Jeweller, WAF, The Architectural Review, Architectural Journal, and MRW.

Slack Technologies, Inc. engages in the development and provision of channels-based messaging platform. Its product is used to review job candidates, coordinate election coverage, diagnose network problems, negotiate budgets, plan marketing campaigns, approve menus, and organize disaster response teams. The company was founded by Daniel Stewart Butterfield, Bradley J. Horowitz, Eric Costello, Callum James Henderson-Begg, and Serguei Mourachov in 2009 and is headquartered in San Francisco, CA.

Yahoo!, Inc. is a guide to digital information discovery, focused on informing, connecting, and entertaining users through its search, communications, and digital content products. It operates through the following geographical segments: Americas; Europe, Middle East, and Africa (EMEA); and Asia Pacific. The company was founded by Jerry Chih-Yuan Yang and David Filo in January 1994 and is headquartered in Sunnyvale, CA.

Slack Technologies LLC (Slack Technologies) is a venture capital firm founded in 2009. The firm is headquartered in San Francisco, California.