Ronald Schellekens is the Vodafone group HR director and a member of the Vodafone executive committee

Susan Martindale was appointed group HR director for Mitchells & Butlers in November 2012 having previously been group purchasing director and divisional operations director

Bunzl is a FTSE 100 support services company with revenues worldwide of more than £8.5 billion

Kate Guthrie joined the group in January 2016 immediately prior to its demerger from National Australia Group and the subsequent IPO and listing on the UK Stock Exchange

Bengougam is responsible for leading HR across EMEA, which includes more than 50,000 employees in 60 countries

As group director for people at Sky Deborah Baker oversees more than 31,000 employees across Europe

Didier Charreton is the Chief HR officer at Anglo American

Jane Storm is the Group people director at Connect Group

Kessar Kalim is the Director of HR at the London School of Hygiene & Tropical Medicine (LSHTM), a position he has held since September 2017.

HR magazine commissioned Ashridge Executive Education to conduct interviews with five of our top-rated HR practitioners from last year's HR Most Influential (HRMI) top 40 practitioners list

Herminia Ibarra is the Charles Handy professor of organisational behaviour at London Business School (LBS)

Adrian Furnham was educated at the London School of Economics and at Oxford University