John Klein

Senior Member of Technical Staff

Key Responsibilities

Developing design and analysis methods for systems-of-systems and helping individuals, teams, and organizations assess and improve their software architecture competence.

Professional Background

John has over 20 years experience developing systems and software. He joined SEI in 2008. Before joining SEI, John was a chief architect at Avaya, Inc. There his responsibilities included development of multimodal agents, architectures for communication analytics, and the creation and enhancement of the Customer Interaction Software Product Line architecture. Prior to that, John was a software architect at Quintus, where he designed the first commercially successful multi-channel integrated contact center product and led the technology integration of the product portfolio as Quintus acquired several other companies. Before joining Quintus, John worked for several companies in the video conferencing and video networking industry. He began his professional career at Raytheon, where he developed hardware and software solutions for radar signal processing, multi-spectral image processing, and parallel processing architectures and algorithms.

Publications (recent or significant)

  • "What is Architecture" (with David Weiss). Chapter in Beautiful Architecture, Spinellis and Gousios, editors. OReilly Media, Jan 2009. (
  • "Interplay of Architecture, Business Goals, and Current Technology in the Evolution of Call Center Systems", Proceedings of 7th Working IEEE/IFIP Conference on Software Architecture (WICSA-7), Vancouver, CA, Feb 2008.
  • "How does the architects role changes as the software ages?", Proceedings of 5th Working IEEE/IFIP Conference on Software Architecture (WICSA-5), Pittsburgh, PA, Nov 2005.
  • with Deborah Hill and David Weiss, Tutorial: "Industrial-Strength Software Product Line Engineering", Third Software Product Lines Conference (SPLC2004), Boston, MA, Aug 2004.
  • US Patent 6,934,381, "Contact Routing System and Method"


Architecture-Centric Engineering Initiative

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