John Sack is currently the Managing Director and Chief Procurement Officer at Citigroup, a position held since 2010. They previously served as the Global Head of Technology Sourcing at JPMorgan Chase & Co. and held senior roles at AIG and ICG Commerce. John earned a Bachelor's degree in Business Administration and Management from Binghamton University in 1988. Prior to their current role, they worked at Citigroup in various finance, operations, and procurement roles from 1990 to 2000.
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