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Glenn Stelloh

@glennstelloh

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Account management leader at Lumen who grew retained contract value 47% year over year.

United States

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At Lumen Technologies, I led a team of senior specialists covering a $28M book, reaching 139% of a $278K monthly retention and migration quota. I provided executive coverage on major deals, including an upsell that added $200K MRR.

I lifted in-term contract rates by 26 points over three years without eroding margin, and grew retained and migrated contract value 47% year over year. I also co-led an AI agent deployed in Microsoft Copilot to every rep, reducing complex migration order setup from 3–5 hours to about 10 minutes.

At ServiceSource International, I delivered outsourced renewals for enterprise technology clients, including about $310M over 10 quarters as a Strategic Account Manager. Earlier, at BT Americas, Inc., I directed a multi-site Avaya-to-Cisco migration and authored $3.2M in follow-on statements of work.

Experience

Work history, roles, and key accomplishments

Senior Manager to Director, Global Partner Success

Lumen Technologies

Jan 2023 - Jul 2026 (3 years 6 months)

Led a quota-carrying team of senior specialists covering a $28M book, reaching 139% of retention and migration quota. Unified post-sale operating model and drove significant revenue growth and process improvements.

Strategic Account Management Revenue Retention Renewals Upselling Migration Salesforce Gainsight Power BI Microsoft Teams Microsoft Copilot AI Automation BPO Team Leadership

Senior Manager, Customer Success — Enterprise Direct

Lumen Technologies

Jan 2022 - Dec 2023 (1 year 11 months)

Led 10 CSMs managing a Key/Large Enterprise portfolio of about $32M ARR, driving a 5-point NPS improvement within one year through structured QBRs.

Customer Success QBR NPS Account Management Salesforce Gainsight

Senior Manager, Customer Success — Systems Integrators

Lumen Technologies

Jan 2021 - Dec 2022 (1 year 11 months)

Led 10 CSMs for Systems Integrator accounts, stress-tested a Customer Health Score model, and helped shape Gainsight configuration across lines of business.

Customer Success Systems Integrator Gainsight Health Scores QBR

Program Director

ESG Success

Jan 2020 - Dec 2020 (11 months)

Designed a global Customer Success Center of Excellence for HPE, including journey map, playbook moments, curriculum, and analytics. Built a client health and maturity assessment as a billable consulting offering.

Customer Success Center Of Excellence Journey Mapping Analytics Consulting

Director, Program Management

BT Americas, Inc.

Jan 2016 - Dec 2020 (4 years 11 months)

Directed complex multi-client programs, including a 2.5-year Avaya-to-Cisco IP Telephony migration across 164 sites. Authored and delivered $3.2M in follow-on statements of work and revitalized a dormant Cisco Rebates Program.

Program Management IP Telephony Cisco UCCE Cisco Avaya Rebate Stakeholder Management

Strategic Accounts, Renewals & Sales Leadership

ServiceSource International

Jan 2007 - Dec 2016 (9 years 11 months)

Delivered outsourced renewals for enterprise technology clients, including leading teams and achieving significant revenue results. Restructured AT&T contract renewal and built new pricing models.

Renewals Strategic Accounts Sales Leadership AT&T White Labeling Pricing Team Leadership