Executive Team

Carl Russo
President and Chief Executive Officer

William Atkins
Executive Vice President and Chief Financial Officer

Mehdi Bradaran
Senior Vice President, Product Operations

John Colvin
Senior Vice President, North American Sales

Michel Langlois
Senior Vice President, Systems Products

Andy Lockhart
Senior Vice President, International Sales

Todd Ortberg
Senior Vice President, Strategic Development

Diane Prins Sheldahl
Senior Vice President, Talent and Culture

Miguel Alonso
Vice President, Software Products

Robert Balsamo
Vice President, Advanced Technology and Architecture

Mark Dressler
Vice President, Major Account Sales

Nathan Harrell
Vice President, National Account Sales

Eoin Heaney
Vice President, Partners

Skip Hirvela
Vice President Regional Sales, U.S.

Michael Horn
Vice President, Strategic Alliances

Gilbert Lévesque
Vice President, Product Engineering

Denis Quinlan
General Counsel

Omar Ramadan
Vice President, Customer Services

David Seda
Vice President, Marketing

Purnam Sheth
Vice President, Core Infrastructure

Jill Von Berg
Vice President, Information Technology


Don Listwin

Christopher J. Bowick

Kevin DeNuccio

Michael Everett

Michael Flynn

Adam Grosser

Michael Matthews

Thomas Pardun

Kevin Peters

Carl Russo
President and Chief Executive Officer

Nathan Harrell

Nathan Harrell, Vice President, National Account Sales

Nathan is vice president of national account sales at Calix, focused on tier-two U.S. service providers. An industry veteran, Nathan has over 25 years of experience in generating growth with successful companies. Prior to Calix, Nathan was vice president of sales at Occam Networks (acquired by Calix). Nathan also served as vice president of sales (Americas) for Redback Networks. Before that, he served in several capacities at Cisco Systems, including area director for the greenfield area and operations director/general manager positions for both the Qwest and Sprint accounts. Earlier in his career, Nathan held positions at Telco Systems as vice president of sales, Sprint as director of national sales and Scientific Atlanta.
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