[3] Whilst at Accenture, he was involved with business school advisory boards at IMD, INSEAD and Oxford.

[4] From 2001 to 2005 he was Chair of the Prince of Wales Business Leaders Forum; Council, World Economic Forum, 1999–2001; deputy chair, Mayor of Seoul's International Business Advisory Council; UK private sector delegate, G8 Digital Opportunities Task Force, 2000–02.

Ellis has been involved in many musical organisations, especially serving as Chairman of English National Opera 2005–12[7] (President 2012–).

[18] Under its auspices he is leading a major initiative to bring new philanthropy into arts and culture through its impact on health, education, wellbeing and the community.

Also, through his Foundation, he hosted around 80–90 concerts a year between 2005 and 2017 at his London home in support of musicians' and music organisations' development, and other fundraising events.