A man with short dark hair, wearing a light blue shirt, is smiling at the camera. In the background, blurred green foliage hints at a serene environment. As he stands there confidently, it's as if he's presenting the robust connectivity of an SD-WAN backbone or showcasing his expertise as a SASE vendor.

Stefan Keller

Chief Technology Officer, SASE

Stefan Keller is Chief Technology Officer for Open Systems' Secure Access Service Edge (SASE) solution and is tasked with continuing the innovation that established the company as a leader in SASE. He played a key role in developing Open Systems' SASE and secure SD-WAN solutions in his previous role as the company's Head of Development.

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  • cisco
  • Corporate
  • Customers
  • Manufacturing
  • SASE
  • SD-WAN
  • SD-WAN Backbone
  • VPN
  • vulnerability
  • zero trust
  • Zero Trust Network Access
  • ZTE
  • ZTNA

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  • André van der Walt
  • Andrina Brun
  • Charlie Gough
  • Christian Brauchli
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  • Francesco Bizzozero
  • Jacqueline de Groen-Lelieveld
  • James Pearse
  • John Koetsier
  • Lenka Sykorova
  • Moritz Mann
  • Open Systems
  • Paul Keely
  • Renato Iten
  • Stefan Keller

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Gartner Recognizes Open Systems as One of Eight Vendors With Complete SASE Solutions

Stefan Keller

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