John McCallum
Chief Operating Officer

John brings over 25 years of experience in healthcare, technology, and consulting to his role as Chief Operating Officer at Singletto. Throughout his career, he has led strategic initiatives and operational transformations across various industries, with a strong focus on realizing the true value for the business and people.

Before joining Singletto, John held leadership positions at leading Technology & Management Consulting companies including Point B, Amdocs, and Stellar Elements, where he guided organizations in designing, implementing and realizing the value of innovative solutions. Within the healthcare industry, his work has encompassed patient engagement, provider experience, and enterprise modernization, always emphasizing a pragmatic, people-first approach. 

At Singletto, John leads overall company operations, scaling, growth strategy, and market expansion - driving the adoption of our Oxafence platform and shaping the company's next phase of growth. He is dedicated to translating bold visions into scalable execution, ensuring that our breakthrough infection-control technologies reach those who need them most.

John lives in Seattle and holds a degree in Management Information Systems from Santa Clara University in California.