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Dennis Cullen has extensive work experience in program management. Dennis currently works as a Program Manager at Casa Systems, Inc. since February 2019. Prior to that, they worked at Cisco Systems for almost a decade, from 2009 to 2018, as the Director of Program Management. Before Cisco, Dennis held the position of Senior Director of Program Management at Starent Networks from April 2005 to December 2009. In this role, they built and managed a team of program managers, oversaw the implementation of a software development process, and led initiatives to improve customer satisfaction and communication.

Dennis Cullen holds a Bachelor's degree in Sociology and Criminal Justice from Eastern Illinois University. No further details regarding the specific duration of their education at the university are given.