Gartner Expert

Mark Cortner

VP, Team Manager

Mark Cortner is a Research Director with Gartner for Technical Professionals research team. Mr. Cortner provides in-depth research and analysis of unified communications (UC, workstream collaboration, and cloud-based services such as Microsoft Office 365 and Cisco WebEx Teams). The topics he currently focuses on include infrastructure and cloud-based telephony, video and UC platforms and numerous Office 365 topics including tenancy, administration and management, Exchange Online, Skype for Business Online, Microsoft Teams, and Office 365 Groups.

Previous experience

Mr. Cortner has been focused on communications applications and services throughout his career. He has previously served in a broad variety of roles, including hardware and software development, product marketing and management, and delivery of professional consulting services.

Professional background

Burton Group

Senior Analyst


Vice President of Product Marketing

Winstar Communications

Director of Broadband Services Product Marketing

Areas of coverage

Digital Workplace and CRM for Technical Professionals


M.B.A., University of Miami

B.S., Electrical Engineering, University of Tennessee

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Top Issues That I Help Clients Address

1Guidance on best practices for implementing Exchange Online (Office 365).

2In-depth technical analysis of communications and collaboration workloads within Microsoft Teams.

3Guidance on how to plan and execute Office 365 tenant-to-tenant migrations.

4In-depth technical analysis of Cisco Webex Meetings, Webex Teams, and Webex Calling platforms.

5Guidance on best practices for migrating from Skype for Business to Microsoft Teams.