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Dan Brennan has a diverse work experience spanning over several roles and companies. Dan started their career in 1986 at Electronic Switching Systems as an IBEW LU#134 Voice, Data, Sound Design and Install specialist. Dan worked there until 1992 when they moved to Advanced Data Technologies, continuing to specialize in the same field. In 1999, they joined Tellabs as a Senior System Specialist, eventually moving up to the roles of Lead System Specialist and Networking Staff Engineer. In 2008, they joined Structured Communication Systems as a Senior Network Engineer.

Dan Brennan attended Triton College from 1984 to 1988. No degree, field of study, or additional certifications are mentioned in the provided information, except for a Cisco Meraki certification (CMNA) obtained in February 2018.