John Sleen

John Sleen currently serves as the Director of Enterprise Customer Success at Sinch since December 2022. Prior to this role, John held various positions at Voyant from January 2017, including Accounts Manager and Project Manager, overseeing service delivery for customers across the USA. John's career at Zayo Enterprise Networks spanned from June 2008 to December 2016, during which John progressed from Manager of Customer Care and Provisioning to Network and Vendor Manager, managing vendor relationships and project expenses. Before joining Zayo, John was a Sales Engineer and a Network Technician at Onvoy from July 1999 to June 2008, delivering technical support for VoIP services and ensuring successful implementations of converged IP customers.