John Calder is a London‑based Partner working at the intersection of global health, life sciences, and international development. He supports governments, NGOs, and multilateral organisations to strengthen health systems with experience across the European Health system and low‑ and middle‑income countries. His work straddles strategy into implementation with a specialism in supply chain, commercial and digital. John lead these workstreams for the NHSE Covid Vaccine Deployment programme, a world leading exemplar.