Cologix Leadership

Cologix’s experienced team of communications infrastructure professionals is committed to providing its customers the highest-standard of local customer support.

Grant van Rooyen

Grant van Rooyen, President and Chief Executive Officer

Prior to forming Cologix, Grant was CEO of IX Investments which was acquired by Cologix in late 2010. He was with Level 3 Communications for 10 years from 1999 until 2009 where he held a number of leadership positions, including President of the Content Markets Group, with responsibility for over $1.5 billion of customer and product revenue.

In addition to his Cologix responsibilities, Grant is a Partner in vR Equity - a private investment firm. Grant has lived and worked around the world and holds a bachelors degree in economics and finance. To contact Grant email grant(dot)vanrooyen(at)cologix.com

Heidi Diemar

Heidi Diemar, Chief Administrative Officer, General Counsel & Secretary

Heidi is the Chief Administrative Officer, General Counsel & Secretary of Cologix, where she is responsible for all legal and human resources affairs within the company and serves as Corporate Secretary to its board of directors. She has 12 years of experience practicing in the areas of mergers and acquisitions of public and private companies, leveraged buyouts, private equity investments, corporate finance, corporate governance and advice to boards of directors. Heidi came to Cologix from Toys “R” Us, Inc., where she was Corporate Counsel and Assistant Corporate Secretary. Prior to working for Toys “R” Us, Heidi was an Associate in the Corporate Department of Paul, Weiss, Rifkind, Wharton & Garrison LLP, where she was a member of the Mergers & Acquisitions Group. Heidi holds a juris doctorate and a bachelor of arts in art history. To contact heidi email heidi(dot)diemar(at)cologix.com
Brian Cox

Brian Cox, Chief Financial Officer

Brian is the Chief Financial Officer for Cologix, where he is responsible for finance, tax, accounting and treasury. Prior to his current role, Brian was Chief Financial Officer for i-transfer, a global financial technology company. Brian also had roles with KPMG LLP, providing financial diligence assistance to financial and strategic buyers in high-tech industries, as well as First Data Corporation, where he held acquisition and integration positions. Brian holds a bachelor’s and master’s degree in business administration. He is also a Certified Public Accountant. To contact Brian email brian(dot)cox(at)cologix.com
Graham Williams

Graham Williams, Chief Operating Officer

Graham is the Chief Operating Officer for Cologix. He is responsible for Operations, Construction, Commercial Management, Marketing and Strategy. In his time at Cologix, Graham has also led the Development and Sales Organizations. He has over 17 years of experience in the data center, communication, Internet, content delivery and video industries. Prior to Cologix, Graham held Product Management and Strategy positions at Charter Communications and Level 3 Communications. Graham holds a master’s degree in business administration and a bachelor’s degree in political science. To contact Graham email graham(dot)williams(at)cologix.com
Matthew Spencer

Matt Spencer, Chief Technology Officer

Matt is the Chief Technology Officer for Cologix. He is responsible for leading engineering and operations for Cologix. Matt has 25 years of experience leading worldwide IT and telecommunications organizations. Matt has served as the Senior Vice President of Global Operations for the Network and Customer Care Centers of Level 3 Communications, as Senior Vice President for Level 3’s IP Network, Voice over IP and Video Engineering and as Director of IT Operations for the University of Colorado Hospital. Matt holds a bachelor’s degree in finance. To contact Matt email matt(dot)spencer(at)cologix.com
Val Milshtein

Val Milshtein, Chief Information Officer & SVP Network Services

Val is the Chief Information Officer & Senior Vice President of Network Services for Cologix. He is responsible for leading Product and Process development as well as Systems and Network Architecture. He has over 20 years of management experience providing product and technology solutions within commercial and government sectors. Prior to Cologix he held a number of product development roles at Level 3 Communications where he directed media content, voice & data, and managed services product development teams and led the transformation of the Product Development Management discipline through the adoptions of Agile development methods. Prior to Level 3, Val was the VP of Business Systems Development for Genuity Solutions, a Bell Atlantic - GTE Corp. Internet and Managed Services provider spin-off. He led the development efforts for separation and ultimately successful IPO of Genuity followed by the largest CRM implementation in the industry. To contact Val email val(dot)milshtein(at)cologix.com
Wayne Dietrich

Wayne Dietrich, Chief Sales Officer

Wayne is the Chief Sales Officer for Cologix, where he is responsible for the sales organization, customer advocacy and the company's distribution strategy. Prior to his current role, Wayne was Head of Strategic Alliances at Ciena where he lead partnership strategy, adjacent technology solutions, go-to-market design, and distribution enablement globally. Prior to his position at Ciena, Wayne held various positions at Siemens Enterprise Communications (now Unify), Level 3 Communications, Qwest Communications (now CenturyLink), and Lucent Technologies (now Alcatel-Lucent), AT&T Bell Laboratories, and Bristol-Myers Squibb. He has over 20 years of diverse experience in sales leadership, strategic alliances, operations, business development, channel optimization and go-to-market design & execution across telecommunications, enterprise, logistics & manufacturing, and research & development environments. Wayne holds a bachelor’s degree in Health Physics (Radiation Science) and master’s in Interdisciplinary Telecommunications. To contact Wayne email wayne(dot)dietrich(at)cologix.com
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