Leadership Team

Committed to our customers

From the field to the office, our people have always been our greatest competitive advantage. The incredible strength of our team around the world has enabled us to assemble an exceptionally experienced Executive Team. Comprised of talented business leaders from a diverse range of industries, our team brings decades of operational excellence and a shared, unwavering commitment to our customers.

Our Leadership Team

  • Nancy C. Southern, Chair & Chief Executive Officer, ATCO Ltd. and Chair, Canadian Utilities Limited
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    Nancy C. Southern

    Chair & Chief Executive Officer, ATCO Ltd. and
    Chair, Canadian Utilities Limited


    Nancy Southern is Chair & Chief Executive Officer of ATCO Ltd., as well as Chair of Canadian Utilities Limited, an ATCO company. Reporting to the Boards of Directors, she has full responsibility for executing the strategic direction for both companies, and for the ongoing operations of ATCO.

    After joining the ATCO Board of Directors in 1989, Ms. Southern served as Co-Chair of ATCO for 16 years prior to being elected Chair in December 2012. Ms. Southern was named President & Chief Executive Officer of ATCO Ltd. in 2003. She serves on the boards of all ATCO subsidiary companies. Ms. Southern also serves as Executive Vice President of Spruce Meadows and is a Founding Director of AKITA Drilling Ltd., a Director of Sentgraf Enterprises Limited, an Honorary Director of the BMO Financial Group and serves on the Rideau Hall Foundation Board of Directors.

    In addition to her business leadership, Ms. Southern has long played a leading role in advocating on social issues of global importance—most notably, the rights of Indigenous peoples and the role of women in business. She is an Honorary Chief of the Kainai (Blood Tribe of Alberta, Canada) and was given the name Aksistoowa'paakii, or, Brave Woman, in 2012. In 2015, at the request of German Chancellor Angela Merkel, Ms. Southern joined 100 other global leaders for the G7 Forum for Dialogue with Women in Berlin.

    Over the course of her career, Ms. Southern has served with some of the world’s most prestigious and influential organizations. She is a member of The U.S. Business Council, a member of the American Society of Corporate Executives, and a Canadian Member of the Trilateral Commission. She is also a member of the Business Council of Canada, the University of Calgary School of Public Policy Advisory Council, and the South Australian Minerals and Petroleum Expert Group.

    In 2018, the University of Calgary School of Public Policy honoured Ms. Southern with the “Distinguished Policy Fellow Award,” in recognition of her lifetime commitment to public policy. Earlier that year, she received the “Canadian Business Leader Award” from the University of Alberta School of Business – making history as the first second-generation recipient of that honour.  

    Ms. Southern was inducted as a Companion into the Canadian Business Hall of Fame in 2017. In that same year, in recognition of her achievements in economics and industry, Ms. Southern was awarded an honorary Doctor of Laws degree from Western University. In 2014, the University of Calgary awarded her its highest academic honour, an honorary Doctor of Laws degree bestowed in recognition of notable achievements and community service.

    In 2013, she received the “T. Patrick Boyle Founder’s Award” from the Fraser Institute for her entrepreneurial achievements and recognized accomplishments in the promotion of freedom and free markets. In 2012, Canada’s Public Policy Forum awarded Ms. Southern the “Peter Lougheed Award for Leadership in Public Policy”.

    In 2016, Ms. Southern was included in Fortune’s list of the “50 Most Powerful Women” outside of the U.S. and recognized by the Financial Post Magazine’s “The Power List”. Previously, she was also included in Fortune’s list of the “50 Most Powerful Women in Business: The Global 50” and named as one of “The 50 Most Important People in Canada” in Maclean’s Magazine. In 2011, she was selected as “Business Person of the Year” by Alberta Venture Magazine and in 2005, was selected “Business Woman of the Year” by the Consumer’s Choice Awards.

    Born and raised in Calgary, Alberta, Ms. Southern studied Economics and Commerce at the University of Calgary.

  • Siegfried W. Kiefer, President, ATCO Ltd. and President & Chief Executive Officer, Canadian Utilities Limited
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    Siegfried W. Kiefer

    President & Chief Executive Officer, Canadian Utilities Limited and
    President, ATCO Ltd.


    Siegfried Kiefer is President of ATCO Ltd. and the President & Chief Executive Officer of Canadian Utilities Limited (CU). Mr. Kiefer was named CU's President & Chief Executive Officer on May 8, 2019, after previously holding the title of President & Chief Strategy Officer for ATCO Ltd. and Canadian Utilities Limited, an ATCO Company, from October 2016, prior to which he held the title of President, Canadian Utilities Limited, from May 2015, and Chief Operating Officer, Power & Utilities, from July 2013.

    Formerly, Mr. Kiefer was Managing Director, Utilities Business Group, where he oversaw the operations of ATCO Gas, ATCO Electric and ATCO Pipelines, along with subsidiaries Northland Utilities Limited and ATCO Electric Yukon. He also oversaw the formation and operations of ATCO Energy Services and served as Chief Information Officer for ATCO Group for more than 11 years, until late 2009.

    Mr. Kiefer’s career with ATCO and its subsidiaries began in 1983 when he started with Canadian Western Natural Gas as a Financial Analyst, and was later appointed to various technical and management roles within Canadian Utilities’ Information Services.

    In 1997, Mr. Kiefer transferred to ATCO Gas Services Ltd., now known as ATCO Energy Solutions, as Manager, Utility Services. One year later, he was appointed Vice President, Information Technology & Chief Information Officer within ATCO Group, and took on the added role as President, ATCO I-Tek, in 1999. In July 2000, Mr. Kiefer was appointed Managing Director, Technologies Business Group, ATCO Ltd. & Canadian Utilities Limited, where he oversaw the operations of ATCO I-Tek while retaining the CIO role within ATCO’s head office.

    Mr. Kiefer has a Bachelor of Commerce degree from the University of Calgary. He is married to Colleen and has a son, Stefan, and a daughter, Reegan.

  • Dennis DeChamplain, Executive Vice President & Chief Financial Officer
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    Dennis DeChamplain

    Executive Vice President & Chief Financial Officer


    Dennis DeChamplain was appointed Senior Vice President & Chief Financial Officer for ATCO, effective June 1, 2017. In this role, he is responsible for the overall financial management of ATCO including Finance, Accounting, Treasury, Taxation, Risk Management, Regulatory Affairs, Investor Relations and Internal Audit. 

    Mr. DeChamplain joined ATCO in 1992 and has held progressively senior financial, regulatory, and business planning positions throughout the company. He transferred to ATCO Electric in 1996 as a Corporate Accountant and in 2010 was promoted to Manager, Financial Reporting and Accounting. In 2013, Mr. DeChamplain was appointed Senior Vice President, Finance & Regulatory with ATCO Electric’s Transmission Division and was responsible for the Corporate Finance, Accounting, Planning, Forecasting, and Regulatory functions.

    Since 2015, Mr. DeChamplain has overseen the financial management of ATCO’s Electricity Global Business Unit in the role of Senior Financial Officer, providing exceptional financial leadership and management of the group’s diversified global operations in electricity generation, transmission and distribution. 

    Mr. DeChamplain was born and educated in Edmonton, and graduated from the University of Alberta in 1985 where he obtained a Bachelor of Commerce degree. He obtained his Chartered Accountant designation in 1988 and is a member of both the Alberta and Canadian Institutes of Chartered Professional Accountants.

  • M. George Constantinescu, Senior Vice President & Chief Transformation Officer
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    M. George Constantinescu

    Senior Vice President & Chief Transformation Officer


    George Constantinescu is Senior Vice President & Chief Transformation Officer with ATCO Ltd., a global leader in integrated energy and infrastructure solutions. In this role, Mr. Constantinescu is responsible for leading transformation initiatives that enable innovation and growth across the enterprise, and advancing new commercial initiatives around the world.

    Mr. Constantinescu first joined ATCO in 1986 and has held progressively senior positions in ATCO Gas, ATCO Electric, ATCO Power and ATCO’s Corporate Office. He played a pivotal role in establishing ATCO’s international electricity generation operations in Australia, as well as evaluating opportunities both in the United Kingdom and the United States. In 2002, he joined ATCO’s Corporate Office as Senior Manager, Corporate Development, where he was an instrumental member of the team that successfully led the strategic divestiture of ATCO’s retail energy operations. Mr. Constantinescu was appointed Senior Vice President & Chief Transformation Officer in February 2018, after spending 14 years cultivating substantial entrepreneurial experience in a range of diverse industries throughout North America.

    Mr. Constantinescu graduated from the University of Alberta with a B.Sc in Electrical Engineering. He is a member of the Board of Directors of OGEO Limited and ORTHOSHOP Geomatics Ltd.

  • George J. Lidgett, Executive Vice President & General Manager, Utilities
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    George Lidgett

    Executive Vice President & General Manager, Utilities 


    George Lidgett is the Executive Vice President & General Manager, Utilities. In this role, Mr. Lidgett is responsible for the operational and service excellence of the company's natural gas and electricity utilities. He brings more than 30 years of ATCO experience to the position. 

    Mr. Lidgett was most recently President, ATCO Structures & Logistics Ltd. He began his career with ATCO Gas in 1985 as Assistant Engineer, Planning & Gas Operations in Edmonton. He held increasingly responsible positions including Engineer, Design, Senior Engineer, Planning, Supervising Engineer, Industrial & Producer Marketing and Manager, Distribution, Edmonton Plant & Equipment.  In 1999, he was appointed Manager, Operations for ATCO Pipelines and a year later, was appointed Vice President, Operations in Calgary. He re-joined ATCO Gas in 2005 as Vice President, Calgary Operations and in 2007 joined ATCO Frontec as Vice President, Commercial and Construction.

    Mr. Lidgett was born and raised in Grande Prairie, Alberta. He graduated from the University of Alberta in 1985 with a B.Sc in Mechanical Engineering. He has served with the Canadian Gas Association, Western Energy Institute and is a former Director of the Canadian Energy Pipeline Association and Van Horne Institute.

  • Adam Beattie, President, Structures
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    Adam Beattie

    President, Structures


    Adam Beattie is the President of ATCO’s Structures division. Reporting to the Chair & Chief Executive Officer, Mr. Beattie is responsible for leading Workforce Housing, Space Rentals, and Permanent Modular Construction business lines worldwide, as well as the manufacturing of modular products.

    ATCO’s Structures division sells and leases Workforce Housing products in Canada, the U.S., Australia, Chile and other select international markets. The Space Rentals and sales business leases and sells relocatable modular offices, classrooms and other structures in Canada, Australia, the U.S. and Chile. . The Structures division also designs and manufactures permanent modular building solutions that include dormitories, schools, daycares, gymnasiums, hockey arenas, gas stations, multi-purpose community centres and offices.

    In Australia, Mr. Beattie managed the successful delivery of the Wheatstone LNG modular project and led the conceptualization and construction of our manufacturing facility in Western Australia. He has also been successful in driving the Structures Global Business Unit’s diversification into non-traditional, resource and construction markets in Canada. 

    Mr. Beattie joined ATCO in 2003 with Structures & Logistics in Brisbane, Australia and has held increasingly senior operational and leadership roles. Mr. Beattie moved to Perth, Western Australia to establish the ATCO Structures business in 2009, returning to Brisbane in 2011 to be involved in securing and executing three major Curtis Island workforce housing projects for LNG facilities being constructed on the island. Mr. Beattie completed his tenure in Australia as Managing Director in 2016, and then relocated with his family to Calgary to become Senior Vice President, North America.  In November of 2017, Mr. Beattie was promoted to the position of Senior Vice President & General Manager, Structures, responsible for all Structures business worldwide.

    Mr. Beattie earned a Bachelor of Business degree in 2001 from the Queensland University of Technology in Brisbane, Australia, and is currently studying for a Bachelor of Law degree from the University of Southern Queensland.

  • Jim Landon, President, Frontec
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    Jim Landon

    President, Frontec


    Jim Landon is President, Frontec, where he leads the development and implementation of an international growth strategy for ATCO’s disaster and emergency response, camp services and operational support services offering.

    Mr. Landon joined ATCO in May 2017 as Vice President, Strategic Research & Development for ATCO Ltd. and was responsible for leading a cross-functional team dedicated to exploring geopolitical, societal, technological and environmental trends impacting the business now and in the future.

    Mr. Landon retired from the British Army in May 2017 after a successful 28-year career having reached the rank of Colonel. Commissioned into the Royal Regiment of Fusiliers, he served as a commander and staff officer in the UK and overseas including operational tours in Northern Ireland, Bosnia, Kosovo, Sierra Leone, Iraq and Afghanistan. He was Commander of the British Army Training Unit in Suffield in Alberta from 2012 to 2015 before completing a final operational tour in Afghanistan in 2016.

    Mr. Landon is a Chartered Manager and was made a Member of the Order of the British Empire by Her Majesty the Queen in 2004. In 2017, he was the recipient of the US Bronze Star and NATO Meritorious Service Medal as Commander of a US Task Force in SE Afghanistan.

    Mr. Landon was educated at the Royal Military Academy Sandhurst and has a Bachelor’s degree in Law and a Masters in International Liaison and Communication.

  • Wayne K. Stensby, Executive Vice President, Corporate Development
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    Wayne Stensby

    Executive Vice President, Corporate Development


    Wayne Stensby is the Executive Vice President of Corporate Development. In his previous role as Senior Vice President & General Manager of the Electricity Global Business Unit for Canadian Utilities Limited, an ATCO company,  Mr. Stensby was tasked with leading the strategy and development for the Electricity Global Business Unit’s long-term products and services growth.

    Mr. Stensby joined ATCO in 1988 and has held a variety of operational and engineering leadership positions, including assignments in Canada, the U.K. and most recently Australia. As Managing Director & Chief Operating Officer for ATCO Australia, Mr. Stensby was responsible for ATCO Australia’s overall operation. 

    Mr. Stensby holds a B.Sc. in Electrical Engineering from the University of Alberta and is registered as a Professional Engineer with APEGA.

  • Marshall Wilmot, President, Retail & Chief Digital Officer
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    Marshall Wilmot

    President, Retail & Chief Digital Officer


    Marshall Wilmot is President, ATCOenergy, and Chief Digital Officer for ATCO. In his dual role, Mr. Wilmot is responsible for establishing the strategic long-range goals of ATCOenergy along with spearheading ATCO’s digital presence and emerging e-commerce platform. 

    ATCOenergy has been ATCO’s retail arm providing electricity and natural gas to homes and businesses in Alberta since 2016, and also integrates ATCO Blue Flame Kitchen as a popular customer-facing program. Securing 10 per cent of competitive retail market share in just three years, ATCOenergy is an exciting area of growth for the company. 

    Since 2018, Mr. Wilmot has overseen ATCOenergy through a key transitional period and implemented company-wide digital development initiatives. With more than 30 years of experience and considerable digital and marketing expertise gleaned from his years of service in senior executive roles at some of the nation’s most reputable brands in retail, airlines and telecommunications, Mr. Wilmot is transforming ATCO’s digital landscape and optimizing the company’s nascent e-commerce platform to deliver a strong brand, drive significant growth and increase revenue.

    Mr. Wilmot earned an MBA from Nyenrode Business Universiteit, the Netherlands, and a Bachelor of Commerce degree (Bcomm, Finance Major) from the University of Calgary.