John Callery is an accomplished professional in human resources and analytics, currently serving as Head of People Operations at Citadel since January 2026. Previous roles include Senior Vice President of HR Strategy & Operations at Gartner, where a global HR Strategy & Operations function was established, and Group Vice President overseeing global analytics and talent acquisition. Additionally, John held the position of Managing Director at BNY, focusing on workforce strategy for a large employee base, and co-founded Rolic, a company aimed at transforming travel experiences through data. Earlier career highlights include leadership positions at AOL and PTC, as well as contributions as a Systems Engineer at NASA. John holds a Master of Science in Business Analytics from NYU Stern and a Bachelor of Science in Applied Mathematics from The Ohio State University.
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