Head of External Relations

The International Institute for Strategic Studies (IISS) is a defence and security think tank that has a deep understanding of regional geopolitics and geo-economics in a global context. Its international researchers provide best-in-class, independent and impartial analysis and offer insights on strategic challenges and priorities to governments and the private sector. It is expert at bringing together national leaders and senior policymakers in foreign policy, defence and security;

promoting dialogue; and facilitating effective and influential bilateral and multilateral consultations.

We are looking for an experienced, commercially minded and inspirational Head of External Relations to lead the organisation's membership and sponsorship activity. Reporting to the Director of External Relations, this is a senior role with responsibility for setting strategy, leading a team of five and delivering growth across both membership and sponsorship for the Institutes global activities.

Approximately 50% of the role is focused on membership and 50% on corporate sponsorship. You will be responsible for developing strategies that grow membership, strengthen member engagement, and increase sponsorship income through high-value corporate relationships with an international client base.

You will play a key role in shaping the wider external relations strategy alongside the Director of External Relations, translating organisational priorities into clear plans and measurable objectives for the team. You will be equally comfortable operating at strategic level and being involved in smaller scale tasks as needed - whether that means leading a major partnership pitch, resolving a member issue, reviewing pipeline data or coaching a team member.

This is a hands‑on leadership role. We are looking for someone who knows when to delegate and empower their team, but who is also willing to actively involve themselves when circumstances require.

• Lead, manage and develop a team of five across membership and sponsorship, setting clear objectives, priorities and performance expectations, and identifying opportunities for professional growth and development.
• Maintain a positive, collaborative and high-performing team culture, ensuring the team has the resources, processes and support required to deliver against its objectives.
• Delegate effectively while maintaining appropriate oversight of and involvement in activities.

• Work closely with the Director of External Relations to shape and deliver the Institute’s external relations strategy.
• Lead the development and delivery of the Institute’s membership and sponsorship strategies, setting ambitious but achievable pipeline, acquisition, retention, and income targets.
• Identify opportunities to grow the membership and sponsorship base by strengthening the value proposition for clients, creating new offers and expanding into new sectors.
• Support the Senior Sponsorship Manager and the Senior Membership Account Manager in all stages of the sponsorship and membership lifecycle.
• Personally lead strategic pitches, negotiations and relationship management discussions where appropriate.
• Build strong relationships with key members, sponsors, and other external stakeholders, acting as a senior escalation point where appropriate.
• Ensure sponsorship and membership propositions are commercially compelling, using client insight, data and feedback to craft proposals, identify opportunities for cross‑selling, upselling, retention, and deepening engagement across all IISS services.
• Oversee client communications, events, benefits, stewardship plans, and engagement activity.