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.

Latest From Stefan Keller

All Topics

  • All Topics
  • Application Performance
  • cisco
  • Corporate
  • Customers
  • IT Staffing
  • Manufacturing
  • MPLS
  • NaaS
  • Network as a Service
  • Network Transformation
  • SASE
  • SD-WAN
  • SD-WAN Backbone
  • VPN
  • vulnerability
  • zero trust
  • Zero Trust Network Access
  • ZTE
  • ZTNA

All Authors

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

All Languages

  • All Languages
  • English
  • German
Showing 0 out of 72
Two business professionals, a man and a woman, greet each other with high fives on the steps of a modern building. The man, dressed in a grey suit and carrying a briefcase, seems to be discussing an SD-WAN backbone with the woman in a beige skirt holding a tablet. Metallic panels glisten in the background.

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

Stefan Keller

Read The Blog
Load More

Leave Complexity
Behind

To learn how Open Systems SASE Experience can benefit your organization, talk to a specialist today.

Contact Us