Management Team

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Executive Bios

Dennis E. Singleton


Dennis E. Singleton has served as a director since 2004. Mr. Singleton is currently the Chairman of our Board, Chair of our Compensation Committee and a member of our Audit Committee. Mr. Singleton was a founding partner of Spieker Partners, the predecessor of Spieker Properties, Inc., one of the largest owners and operators of commercial property on the west coast prior to its $7.2 billion acquisition by Equity Office Properties Trust in 2001. Mr. Singleton served as Chief Financial Officer and Director of Spieker Properties, Inc. from 1993 to 1995, Chief Investment Officer and Director from 1995 to 1997 and Vice Chairman and Director from 1998 until his retirement in 2001. During his tenure, Mr. Singleton was involved in identifying and analyzing strategic portfolio acquisition and operating opportunities and oversaw the acquisition and development of more than 20 million square feet of commercial property. From 2001 to the present, Mr. Singleton has managed personal investments in real estate. Mr. Singleton is currently a member of the board of directors and serves on the audit and compensation committees of BRE Properties, Inc., which is listed on the New York Stock Exchange. Mr. Singleton received a Bachelor of Science degree from Lehigh University and a Master of Business Administration degree from Harvard Business School.

William Stein

A. William Stein

Chief Executive Officer

A. William Stein (Bill) has served as Digital Realty’s Chief Executive Officer since November 2014 and as Chief Financial Officer from July 2004 until April 2015. Previously, he held the role of Chief Investment Officer from July 2004 until April 2014.

Prior to joining Digital Realty, Bill was with GI Partners, Digital Realty’s predecessor private equity fund. Bill has over thirty years of investment, financial, and operating experience in both large company environments and small, rapidly growing companies. Prior to joining the company, Bill provided turnaround management advice to both public and private companies. Bill has held a wide range of leadership roles, including Co-Head of VentureBank@PNC and Media and Communications Finance at The PNC Financial Services Group, where he was responsible for directing the delivery of PNC’s products and services to VentureBank’s high technology and emerging growth client base; President and Chief Operating Officer of TriNet Corporate Realty Trust (now part of iStar Financial); Executive Vice President, Chief Financial Officer and Secretary of TriNet Corporate Realty Trust; and a number of senior investment and financial management positions with Westinghouse Electric, Westinghouse Financial Services and Duquesne Light Company. Bill practiced law for eight years, specializing in both litigation and securities & finance.

Bill received a Bachelor of Arts degree from Princeton University, a Juris Doctor degree from the University of Pittsburgh, and a Master of Science degree with Distinction from the Graduate School of Industrial Administration at Carnegie Mellon University.

Andrew Power

Andrew Power

Chief Financial Officer

Prior to joining Digital Realty, Andy served as Managing Director of the Real Estate, Gaming and Lodging Investment Banking for Bank of America Merrill Lynch, where he was responsible for relationships with over 40 public and private companies, including Digital Realty. Prior to Bank of America Merrill Lynch, Andy was employed by Citigroup, where he held similar positions. During his career, he has managed the execution of public and private capital raises in excess of $30 billion, including the largest REIT IPO to date, and more than $19 billion of merger and acquisitions transactions. Andy was part of the lead underwriting team that advised Digital Realty on its initial public offering in 2004 and served as a lead manager on nearly every subsequent public capital raise.

He received a Bachelor of Science degree in Analytical Finance from Wake Forest University.


Jarrett Appleby

Chief Operating Officer

Jarrett Appleby joined Digital Realty in April 2015 as the company’s first Chief Operating Officer and is responsible for corporate strategy and global operations, including property and technical operations; design and construction; EMEA and APAC operations; and product management and development.

Jarrett has more than 25 years of experience as a technology leader, spanning strategy, corporate development, sales and marketing, and global operations, including several executive leadership roles in the data center and telecommunications industry. Immediately prior to joining Digital Realty, he served as founder and CEO of the Appleby Group, an independent consultancy advising private equity and technology companies. Previously, Jarrett was Chief Operating Officer of CoreSite Realty from 2012 to 2014, and Chief Marketing Officer of Equinix from 2008 to 2012.

He received Bachelor of Arts and MBA degrees from Lehigh University.

Scott Peterson

Scott Peterson

Chief Investment Officer

Scott has over 27 years of real estate experience, including Senior Vice President with GIC Real Estate, the real estate investment entity for the Government of Singapore Investment Corporation. Scott was also active in investments, development and asset management with LaSalle Partners, a real estate services company, and Trammel Crow Company, a real estate developer. Scott earned a Bachelor of Arts degree from Northwestern University and a Master of Business Administration degree from Northwestern University.

William Stein

Michael Henry

Chief Information Officer

Michael Henry joined Digital Realty in April 2015 as the company’s first Chief Information Officer. He is responsible for all aspects of the company's IT infrastructure, including business intelligence, internal business applications, and information security. Prior to Digital Realty, Michael was the Chief Information Officer for Rovi.

Michael has more than 25 years of enterprise-wide business and technology experience, including leadership roles at Ericsson, Align Technology, and Applied Materials.

Michael received a Bachelor of Science degree in Information Systems Management from the University of San Francisco.

Chris Sharp

Chris Sharp

Chief Technology Officer

Chris Sharp has over 20 years of experience in the technology industry, with an extensive background in developing technology strategies in global markets. He has a deep knowledge of the data center sector and is well positioned to expand technical innovation at Digital Realty. Most recently, he was responsible for cloud innovation at Equinix, where he led the development of innovative cloud services solutions and developed new capabilities enabling next-generation, high-performance exchange and interconnection solutions, facilitating broad commercial adoption of cloud computing on a global basis. Previously, Mr. Sharp held leadership positions at top network and colocation providers, including Qwest Communications, MCI/Verizon Business and Reliance Globalcom.

Kris Kumar

Matt Miszewski

Senior Vice President, Sales and Marketing

Matt Miszewski is Senior Vice President, Sales and Marketing, at Digital Realty, responsible for overseeing the company’s sales and leasing efforts as well as marketing activities globally. He joined Digital Realty in January 2013.

His more than 20+ years of professional experience includes a prior role at, where he was Senior Vice President, Enterprise Sales and the Global Public Sector, responsible for establishing a new enterprise sales program that was focused on global and strategic accounts. He also served as General Manager, Worldwide Government at Microsoft, where he reformed the firm’s Global Public Sector business unit to focus on industry relevant solution-selling for the government vertical. In addition, earlier in his career, Matt worked as Chief Information Officer for the State of Wisconsin, President of an IT consulting firm and partner in a law firm.

Matt received his Law Degree from the University of Wisconsin Law School and his Bachelor of Arts from Marquette University.

Ellen Jacobs

Ellen Jacobs

Senior Vice President of Corporate Services

Ellen Jacobs is Digital Realty’s Sr. Vice President of Corporate Services, responsible for our Human Resource and Enterprise Technology functions. Prior to joining Digital Realty, Ms. Jacobs served in various Vice President of Human Resource positions at Charles Schwab, Advanced Micro Devices, and Continental Grain Company. Ms. Jacobs spent 15 years as a grain trader with Continental Grain, Central Soya and Cargill, Inc. prior to entering the Human Resource field. Ms. Jacobs received a Bachelor of Science degree in Business from the University of Colorado – Boulder and an MBA from Northwestern Kellogg Graduate School of Management.

Joshua A. Mills

Joshua Mills

Senior Vice President, General Counsel

Mr. Mills joined Digital Realty as General Counsel in April, 2005. Prior to joining Digital Realty, Mr. Mills was a corporate attorney with Latham & Watkins, LLP where his practice included mergers and acquisitions, corporate finance and venture capital financing transactions as well as general company representation. Prior to joining Latham & Watkins, Mr. Mills served as Associate General Counsel for Corporation and as an associate with Shearman & Sterling, LLP. Mr. Mills received a B.A. degree from the University of Washington and a J.D. from the University of California, Hastings College of the Law.

Edward F. Sham

Edward Sham

Senior Vice President and Controller

He joined the company in September 2005. With more than 20 years experience, his previous positions include Vice President & Controller of Catellus Development Corporation, now part of ProLogis ; Controller of Bay Apartment REIT, now Avalon Bay; and O’Connor Realty Advisors. In addition, Mr. Sham was a practicing CPA for Ernst & Young LLP in their real estate group for seven years. Mr. Sham received a B.S. degree from San Francisco State University and is a member of AICPA and California CPA society.

Kris Kumar

Bernard Geoghegan

Managing Director, EMEA

Bernard Geoghegan joined Digital Realty in April 2013 as managing director, EMEA, and is responsible for managing and driving the growth of the company’s operations in EMEA. Previously, Mr. Geoghegan served as executive vice president of Colt Data Centre Services and was instrumental in developing its modular data centre offering. Prior to joining Colt, Mr. Geoghegan served as senior vice president of International Operations at Digital Realty from 2008 through 2010 after joining the Company in 2006 as vice president, Europe.

Mr. Geoghegan is a veteran of the IT industry with over 25 years of experience in the sector. Prior to joining DLR in 2006, Bernard was the chief executive officer of Servecentric Ltd., a provider of colocation and premium managed services to the Irish market. Previously, Bernard held senior operations and IT roles at Worldport and Xerox Europe and held various IT management and Software Development roles with Pioneer Investments, Informix Software Inc., Digital Equipment Corporation and Ashton-Tate.

John Stewart

John Stewart

Senior Vice President, Investor Relations

John Stewart has served as Digital Realty’s Senior Vice President of Investor Relations since August 2013. He has over 15 years of financial services industry experience.

Prior to joining Digital Realty, John led the industrial and technology REIT sector coverage at Green Street Advisors, a leading independent real estate research firm. Previously, he was the lead REIT analyst at Credit Suisse. John has followed the REIT sector since 2000, formerly as a member of top-ranked teams at Citigroup Investment Research and Merrill Lynch. John began his career as a credit analyst with the Corporate Finance group at Bank of America.

John received a Bachelor of Science degree in Accounting from Oklahoma State University. He is a CFA charterholder and a member of the CFA Institute as well as the New York Society of Securities Analysts. John is also a member of the National Association of Real Estate Investment Trusts and the National Investor Relations Institute.

William Bradley

William Bradley

Senior Vice President of Partners and Alliance

William (Bill) Bradley is Senior Vice President of Partners and Alliances at Digital Realty, responsible for leading the company’s Partner and Alliance Program and developing the firm’s corporate strategy.

Prior to taking on this role in April 2015, Bill served as Digital Realty’s Senior Vice President of Strategy and Corporate Development. He joined Digital Realty following a 17-year career in investment banking including six years at Credit Suisse where he most recently served as a Managing Director in Credit Suisse’s Global Mergers & Acquisitions Group, focused on telecommunications service provider and data center operators. Previous to his career at Credit Suisse, Bill held similar positions at Citigroup for nine years. Bill received a Master of Business Administration from New York University and a Bachelor of Arts in Philosophy from Tufts University.

Phillip Lin

Phillip Lin

Senior Vice President, Strategy

Philip Lin has served as our Senior Vice President of Global Strategy since August 2015. He has over 15 years of related experience, most recently in the Asia Pacific region with 21Vianet. Prior to this, he was involved with financing several leading data center and Internet infrastructure companies as a private equity investor at Kluge & Company. He is a graduate of Cornell University and Columbia University Graduate School of Business.

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