Leadership

We are ConvergeOne, and we are Charged by Greatness.

JOHN A. MCKENNA JR.
Chairman + Chief Executive Officer

John has led ConvergeOne since 2008 through a number of acquisitions and substantial growth. Previously, he served 8 years as CEO of Siemens IT Solutions and Services, CEO of ENTEX Information Services and Sr. EVP at JWP Inc. He got his start at IBM, where he rose to oversee one of the largest branch operations in New York City.

JEFFREY E. NACHBOR
Chief Financial Officer

Jeffrey manages all aspects of our financial planning, assessment and reporting. He previously served at Leap Wireless and at H&R Block. A certified public accountant, Jeffery holds a bachelor’s in accounting from Old Dominion and an MBA from the University of Kansas.

D. ROBERT MARTIN
President, Field Organization

D. has more than 20 years of leadership experience in the technology industry. He joined ConvergeOne in 2020 and previously held executive roles at Red Hat, VCE and Cisco. Martin holds bachelor’s degrees in economics and political science from Queens College and is a member of Business Executives for National Security.

EUGENE O'CALLAGHAN
President, Services Organization

Eugene brings more than 25 years of portfolio engineering and services leadership experience to ConvergeOne. Most recently, he held the role of SVP and Offering General Manager for cloud and infrastructure services at DXC Technology with general management responsibility for sales and partnerships, portfolio management and engineering, and service delivery. He holds a Bachelor’s degree in computer science from University College Cork, Ireland.

COLLEEN HABERMAN
Vice President, Human Resources

Colleen brings more than 25 years of experience in human resources to her role. She previously held executive roles at Univita Health Inc., BioScrip, Express Scripts and Prudential Home Mortgage (now Wells Fargo Home Mortgage). Colleen holds a bachelor of arts degree from the University of Minnesota.

MARK LANGANKI
Chief Technology Officer

As CTO, Mark spearheads our innovations in technology solutions and services. He spent 25 years as the Chief Operating Officer at Spanlink Communications, which we brought on board in 2014. A graduate of the University of Minnesota, Mark has been an instructor there since 1996 and in 2014 assumed the role of Associate Program Director.

TAMARA SHAW
Vice President, Transformation + Integration

Tamara has more than 25 years of industry experience successfully leading teams in business, operational, financial and productivity improvement and organizational change. She joined ConvergeOne from Atos International where she was the Vice President, North America Service Operations.   Tamara holds a BBA degree from University of Houston, C.T. Bauer College of Business and an MBA from Texas A&M University – Commerce and has been both PMP and Six Sigma Green Belt certified.