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Management Team

The Doosan GridTech team has managed more utility-integrated energy storage projects than any other team in the industry. Today, we’re extending that focus to encompass a broader set of distributed energy resources.

Daejin Choi

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Daejin Choi

Chief Executive Officer

Daejin Choi is the Chief Executive Officer of Doosan GridTech, responsible for all aspects of company strategy and execution.

Daejin joined Doosan Heavy Industries in 2009 and has led major initiatives in strategy development, process improvement and M&A over his seven years with the company. Prior to Doosan, he was with the Boston Consulting Group assisting clients in the industrial goods, consumer electronics and banking sectors. He began his career as an Economist at The Bank of Korea.

David Kaplan

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David Kaplan

Chief Technology Officer

David Kaplan is Chief Technology Officer of Doosan GridTech, responsible for leading technology design and development.

David founded 1Energy Systems in 2011 and led the firm as CEO until it joined Doosan. He has over 30 years of technology experience in fields including controlled charging of electric vehicles, database management, web services, and radio-frequency identification (RFID). His work experience prior to Doosan includes roles at Microsoft, Snohomish PUD, Impinj and as the founder of V2Green.

Michael Atkinson

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Michael Atkinson

VP, Sales and Business Development

As VP, Sales and Business Development, Michael is responsible for developing new business opportunities in the utility market and managing the team focused on working with our utility customers. He has 20-years of experience in engineering and construction specializing in the energy and utility industry, and spent over a dozen years leading software technology companies which practiced in the advancing smart grid market. Most recently, he was the top executive spearheading the North American region for GE Grid Solutions and Alstom Grid. Prior to that, he headed up the Network Management Software Division of Alstom Grid in North America, South America and China.

Tom Melling

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Tom Melling

Chief Strategy Officer

Tom Melling is Chief Strategy Officer, responsible for the company’s strategy execution by helping align key functions of planning, business development, resource and capacity development, legal and risk management, and process improvement.

Tom has more than a decade of experience as a software executive and successful startup entrepreneur. At Serengeti Law, as Vice President of Product Management, he helped lead the company from its inception in 2001 through its acquisition by Thomson Reuters in 2010. Tom served as President of the Serengeti Law division of Thomson Reuters from the merger until 2012.

Andrew Miller

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Andrew Miller

VP, Software Engineering

Andrew Miller is VP, Software Engineering at Doosan GridTech, responsible for all aspects of software engineering and product development.

Andrew has over 20 years of software and services development experience with database management systems, web services, service-oriented architectures (SOA), and software as a service (SaaS). At Microsoft, Andrew delivered multiple versions of Microsoft Access, helped shape the user experience in Microsoft SharePoint, and led the global engineering team responsible for Microsoft CRM and Microsoft CRM Online.

Dan Sowder

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Dan Sowder

Vice President, Power System Integration

Dan Sowder is Vice President, Power System Integration for Doosan GridTech, responsible for the design, installation, and deployment of operational projects.

Dan is a recognized industry expert in energy storage and distributed energy management, leading the design, installation, and operations of multiple utility-scale energy storage systems while working in Duke Energy’s Emerging Technology Office. He led multiple grid technology deployments and business model initiatives designed to enhance the value of renewable energy on the grid. Prior to working at Duke Energy, Dan served as a nuclear submarine officer in the U.S. Navy.

Harry Sung Yoon

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Harry Sung Yoon

Chief Finance Officer

Harry Sung Yoon is the Chief Finance Officer at Doosan GridTech, responsible for the finance and HR.

Harry joined Doosan Corporation in 2000 and has held roles handling finance management, accounting, treasury, corporate governance and supporting acquisitions and restructuring projects including Doosan Bobcat, Doosan Motrol, and Doosan FMS. More recently, he has done financial planning, budget control, strategic financial analysis and managed financial operations as part of Doosan Heavy Industries.

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CEO Message


Doosan GridTech will continue to serve its customers and build a smarter energy world by delivering solutions that provide automatic management and optimization of distributed energy resources.

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We’re looking for great people to help us build the future of clean energy systems.

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