He is a member of UKCIS (UK Council for Internet Safety) and sits on the UKCIS evidence group, education working group and the early warning group as well as on the advisory board for the UK Safer Internet Centre. He also sits on the Roblox trust and safety board where he represents the Insafe network. He was part of an expert steering group with TikTok looking at harmful and dangerous online challenges and regularly contributes to content for Internet Matters, as well as delivering their online safety training for those working with children in care commissioned by Ofcom.

Karl has worked for a number of key players in the UK and abroad including CEOP (Child Exploitation and Online Protection Centre), BECTA (British Educational and Communications Technology Agency), the European Commission, the UN and several Local Authorities within the UK and in Europe.

As an ex primary headteacher, he continues to work closely in schools across Europe with children, young people, parents, teachers and governors to develop safer online behaviours and the promotion of digital literacy. Karl has been employed for the last 20 years as an in-house consultant for European Schoolnet in Brussels where he is part of the team that coordinates the European network of Safer Internet Centres on behalf of the European Commission as part of their Better Internet for Kids programme. Karl was the Chair of the Board of Trustees of the Marie Collins Foundation for 7 years, a charity which supports young people who have been sexually abused and exploited online and is now Chair of the board of trustees of Childnet international and Chair of the executive committee of SACPA (Safeguarding and Child Protection Association). Karl has also worked with the International Telecommunications Union (ITU) and chaired the working group to re-write their Child Online Protection Guidance.

Karl is a member of the Go-Safer advisory board. Go-Safer is a new multi-stakeholder initiative led by the International Telecommunication Union (ITU) in collaboration with the World Health Organization (WHO), the University of New Hampshire (UNH).