Zack Schaefer is a Principal Solution Architect at Elisity, where he helps enterprises design and implement identity-based microsegmentation and Zero Trust strategies across complex, hybrid environments. He brings 25 years in enterprise networking and security, including more than 15 at Cisco: first inside Cisco IT as a wireless architect and branch design owner for the company's own global network, with design ownership for early enterprise IPv6, then as a Technical Solutions Architect covering routing, switching, mobility, and L4-L7 services for large retail, financial services, healthcare, and manufacturing accounts. Senior architecture roles at Viptela and Aviatrix followed, focused on SD-WAN and multi-cloud network design for Fortune 200 enterprises. Having owned and operated a large enterprise network himself, Zack brings a practitioner's view to the segmentation challenges security leaders face today. He is based in Raleigh, North Carolina.