John McCallum

John McCallum is the Chief Operating Officer at Singletto, where they are focused on scaling innovative infection-control technologies, including the FDA-cleared Oxafence mask. With extensive experience across consulting, product development, and healthcare, they have led transformational initiatives that integrate innovation, human interactions, and technology. Their prior roles include senior positions at Point B, Amdocs, and Price Waterhouse Coopers, where they built high-performing teams and delivered impactful projects. John holds a reputation for a customer-first approach and operational excellence, driving measurable value through complex programs and strategic insights.