Thomas Glennon
Brookfield
Summary
Principal Network Engineer with an extensive track record of designing and deploying high-availability IP/MPLS core networks that drive service reliability for major mobile wireless carriers. Proven impact on design innovation and operational efficiency through advanced network protocol development and comprehensive architecture evaluations across large network environments.
Overview
27
27
years of professional experience
1
1
Certification
Work History
Principal Network Engineer
U.S. Cellular/ T-Mobile
Schaumburg
07.2017 - Current
- Designed and deployed high-availability IP/MPLS core networks for mission-critical mobile wireless applications and services.
- Developed, implemented, and tested new network protocols for secure core MPLS networks.
- Configured routers, switches, firewalls, and other hardware to establish and manage LAN, WAN, and large-scale mobile wireless networks, enhancing network reliability.
- Evaluated current networking technologies and recommended improvements, optimizing network performance and functionality.
- Identified areas of improvement within existing network architecture.
- Guided teams on best practices for networking technologies and vendor platforms including Cisco, Juniper, and Nokia, ensuring adherence to industry standards.
- Maintained local area networks (LANs) and wide area networks (WANs) across multiple locations.
Consulting System Engineer - Public Sector
Cisco Systems
Rosemont
06.2016 - 06.2017
- Applied advanced technical skills to troubleshoot complex problems and implement effective solutions, enhancing overall system reliability.
- Delivered primary route and technical support for public sector desert plains operations, ensuring seamless operations.
- Coordinated with diverse teams to achieve objectives and resolve product-related issues, fostering collaboration and efficiency.
Systems Engineer IV - Public Sector
Cisco Systems
Rosemont
07.2013 - 05.2016
- Delivered architectural design and deployment support for strategic public sector accounts in Upper Midwest, enhancing client infrastructure and service delivery.
Systems Engineer IV - Service Provider
Cisco Systems
Rosemont
07.1999 - 05.2013
- Designed and deployed next-gen IPBH/LTE 4G EPC EVDO 1xRTT solutions, enhancing service delivery for strategic service providers and mobile wireless carriers.
- Developed foundational network architectures and platform recommendations for US Cellular during three major MPLS core network evolutions over 13 years.
- Created foundational network architectures and platform recommendations for US Cellular, facilitating three major MPLS core network evolutions over 13 years.
- Executed replacement IPBH designs for MetroPCS Tier I markets, utilizing optical and packet Cisco solutions to modernize network infrastructure.
Education
Bachelor of Science - Applied Mathematics and Computer Science
University of WI - Milwaukee
Milwaukee, WI08-1984
Skills
- IOS XR
- IOS XE
- NX-OS
- IGP - ISIS, OSPF, EIGRP
- MP-BGP
- MPLS, Segment Routing
- SD-WAN
- LTE
- 5G
- EvDO
- Cisco 8000 Series
- CIsco ASR9900
- Cisco ASR1000
- Cisco NCS5500
- Nexus 9000
- Nexus 7000
- Nexus 5000
- Juniper MX Series
- Nokia 7750 SR
Certification
- CCIE - Routing & Switching
- CCIE - Service Provider
- CCIE - Security
- CCIE - WAN Switching
- CCIE - Dial ISP
- CCIE # 3263
- CCDE Scheduled, 07/01/2026
Timeline
Principal Network Engineer
U.S. Cellular/ T-Mobile
07.2017 - Current
Consulting System Engineer - Public Sector
Cisco Systems
06.2016 - 06.2017
Systems Engineer IV - Public Sector
Cisco Systems
07.2013 - 05.2016
Systems Engineer IV - Service Provider
Cisco Systems
07.1999 - 05.2013
Bachelor of Science - Applied Mathematics and Computer Science
University of WI - Milwaukee