Leadership Team

Committed to our customers

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. Together, they bring decades of operational excellence and a shared, unwavering commitment to our customers.

Our Leadership Team

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

    Nancy C. Southern

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


    Nancy Southern is Chair & Chief Executive Officer of ATCO Ltd., and Chair & Chief Executive Officer of Canadian Utilities Limited, an ATCO company. Reporting to the Boards of Directors, she is responsible for the leadership, strategic direction, and operations of both companies.

    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 also serves as Executive Vice President of Spruce Meadows Ltd. and is a founding Director of AKITA Drilling Ltd., a Director of Sentgraf Enterprises Limited, an Honorary Director of 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 prominent 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) 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 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 influential academic and business organizations. She is a member of the Business Council of Canada, the U.S. Business Council, the American Society of Corporate Executives, and is a Canadian member of the Trilateral Commission. She also sits on the University of Calgary School of Public Policy Advisory Council. In 2020, Ms. Southern was appointed to the Premier of Alberta’s Economic Recovery Council to help guide the province through the economic downturn resulting from the COVID-19 pandemic.

  • Melanie Bayley, President, ATCO Electric
    Melanie Bayley

    Melanie Bayley

    President, ATCO Electric


    Melanie Bayley leads ATCO’s Electricity division, bringing extensive experience in the natural gas and electricity utility industries in Alberta and Canada’s north. She is accountable for the strategic and operational direction of the electricity transmission and distribution business in Alberta, the Yukon and Northwest Territories.

    Ms. Bayley joined ATCO in 2000 as a natural gas System Planning Engineer, advancing to increasingly complex management and executive positions. In 2010, she was made the division’s Director, Regulatory & Pricing, followed by her 2014 appointment to Vice President, Regulatory. In 2015, she became Vice President, Innovation & Engineering, overseeing natural gas engineering and capital programs while fostering strategic decarbonization and energy transitioning plans. She was appointed as the global Chief Regulatory Officer for natural gas and electricity utilities in 2016, became the Senior Vice President & General Manager, Electricity, in 2019, then promoted to her current role in 2020.

    Ms. Bayley also brings emergency and crisis management expertise. She led ATCO’s response to Canada’s worst natural disaster, the 2016 Fort McMurray wildfires, and continues her pandemic-response leadership, maintaining essential electricity service to customers while ensuring public and employee health and safety. She serves on various boards and industry committees (Western Energy Institute, Canadian Electricity Association (CEA), Drake Landing Solar Community) and has been a featured panelist at the Globe Forum for sustainable business, the Edison Electric Institute’s Global Electrification Forum and a keynote speaker at the CEA’s 2021 Regulatory Forum.

    Ms. Bayley holds a degree in Civil Engineering from the University of Alberta, is a member of APEGA and has completed the Richard Ivey School of Business’ Executive program at Western University. She lives in Sherwood Park, Alberta, with her husband and two children. 

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

    M. George Constantinescu

    Senior Vice President & Chief Transformation Officer


    George Constantinescu is Senior Vice President & Chief Transformation Officer with ATCO and Canadian Utilities Limited. 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 Chairman Emeritus of OGEO Limited and ORTHOSHOP Geomatics Ltd. 

  • Bob J. Myles, Executive Vice President, Corporate Development
    Bob J. Myles




    Bob Myles is currently the Executive Vice President, Corporate Development. 

    As Executive Vice President, Mr. Myles is responsible for growing the company’s footprint in strategic global markets, the ongoing operations of Canadian Utilities’ non-regulated businesses in North and South America.

    For over 25 years, Mr. Myles career has focused on the Canadian industrial sector in oil and gas, power and midstream markets. Most recently, he was the Chief Operating Officer of Stuart Olson Industrial Group where he led the operations since January 2016. Prior to joining Stuart Olson, Mr. Myles held a number of executive roles, including President and CEO of Tartan Canada Corporation; Managing Director of Energy at ATCO; Senior Vice President, Corporate Development at ATCO; President of ATCO Pipelines; and President of ATCO Energy Solutions.

  • Becky A. Penrice, Executive Vice President, Corporate Services
    Becky Penrice




    Becky Penrice is Executive Vice President, Corporate Services.  

    Ms. Penrice leads ATCO’s Human Resources, Executive and Common Services, Facilities Operations, Corporate Governance & Secretarial, Corporate Communications and Aviation teams.  In this position, she has overall responsibility for leading the administrative and business support functions of the Company; guiding the evolution of the corporate culture; supporting the Executive leadership and Board of Directors; and facilitating and driving key strategic initiatives throughout the organization.

    Prior to joining ATCO, Ms. Penrice was Interim CEO for Sears Canada Inc. where she led the wind down of the operations in Canada.  Prior to joining Sears Canada, Ms. Penrice spent over 18 years at the Hudson’s Bay Company where she progressed through several senior Human Resources and Operational positions spanning Logistics, Credit & Loyalty, Merchandising, Marketing, Global Sourcing and Specialty Retail as well as having North American responsibilities for Corporate Human Resources serving HBC and Lord & Taylor.  

    Ms. Penrice has a track record of implementing strategic transformation across all business channels, improving enterprise-wide performance.  She has a strong philanthropic commitment and recently served as the President of the Sears Canada Charitable Foundation.

    Ms. Penrice holds a Honours Bachelor Degree from York University.  She is a passionate advocate for the fight against world poverty and hunger, sponsoring individuals in need abroad and volunteering at food banks closer to home.  

  • Jason Sharpe, President, ATCO Gas & Pipelines
    Jason Sharpe

    Jason Sharpe

    President, ATCO Gas & Pipelines


    Jason Sharpe leads ATCO’s Gas & Pipelines division, bringing extensive experience in energy management and sustainability, standards, pipeline design and integrity, operations, and major project management oversight. He is accountable for the strategic and operational direction of the company’s natural gas transmission and distribution business in Alberta.

    Mr. Sharpe joined ATCO in 2002, bringing his Civil Engineering expertise to lead key pipeline projects and engineering groups. In 2014, he was appointed Vice President of Engineering & Construction, then Senior Vice President & General Manager in 2015 of ATCO’s natural gas pipelines division. Following the 2018 incorporation of the Gas Distribution & Transmission businesses into a single management team, Mr. Sharpe was appointed as the Senior Vice President & General Manager, responsible for leading the new integrated structure. He was promoted to his current role in 2021.

    Mr. Sharpe is the Vice Chair of the Canadian Gas Association’s Board of Directors and a Director with the Canadian Energy Pipeline Association. He is a past Board member of the Pipeline Research Council International and the Van Horne Institute, and was an Executive Panelist at the 2016 International Pipeline Conference & Exposition and a Strategic Speaker at the Global Petroleum Show.

    Mr. Sharpe holds a degree in Engineering and a Master of Business Administration in Global Energy Management & Sustainability from the University of Calgary and is a member of APEGA. Before starting his career, he was a member of the Canadian Freestyle Ski team and shares his love of skiing with his wife and five children. 

  • Brian P. Shkrobot, Executive Vice-President & Chief Financial Officer
     Brian P. Shkrobot

    Brian P. Shkrobot

    Executive Vice-President & Chief Financial Officer


    Brian Shkrobot is Executive Vice President & Chief Financial Officer, Canadian Utilities Limited.

    In this role, to which he was appointed in October 2021, Mr. Shkrobot is responsible for the overall financial management of Canadian Utilities including Finance, Accounting, Treasury, Taxation, Risk Management, Investor Relations and Internal Audit. He is also responsible for ATCO’s Sustainability and Information Technology functions and Regulatory Affairs for ATCO’s utilities divisions in Canada, Australia and internationally. He is focused on both financial and regulatory excellence and creating value for share owners.

    Mr. Shkrobot joined ATCO in 2000 as Corporate Accountant and over the past 21 years has held progressively more senior roles within the organization. Prior to his current role, he was Senior Vice President, Finance & Regulatory, overseeing all financial and regulatory matters for ATCO’s Natural Gas and Electric utilities divisions in Alberta and Canada’s North and advancing a number of enterprise-wide finance, governance and audit initiatives. Before that he was the Senior Financial Officer for ATCO’s former Electricity and Pipelines & Liquids Global Business units, responsible for the financial management of natural gas, electricity, storage & liquids and power generation businesses.

    Mr. Shkrobot holds a Bachelor of Commerce degree from the University of Alberta and is a Chartered Professional Accountant.


  • Sarah J. Shortreed, Executive Vice President & Chief Technology Officer
    Sarah J. Shortreed

    Sarah J. Shortreed

    Executive Vice President & Chief Technology Officer


    Sarah Shortreed is ATCO’s Executive Vice President and Chief Technology Officer.

    Her responsibility includes leading ATCO’s Information Technology (IT) function as it continues to drive agility and collaboration throughout ATCO’s global businesses. Ms. Shortreed is also responsible for ATCO IT’s approach to expanding and enhancing its enterprise IT strategy, including establishing ATCO’s technology roadmap for the future. 

    Ms. Shortreed's skill and expertise are drawn from her more than 30 year career that spans many industries and includes executive roles in business consulting, complex multi-stakeholder programs, operations, sales, customer relationship management and product management. She was recently the Chief Information Officer at Bruce Power and has previously worked at BlackBerry, IBM and Union Gas. 

    Ms. Shortreed earned her Bachelor of Engineering Science – Mechanical degree from the University of Western Ontario. She sits on the Board of Governors for the University of Western Ontario and is the current Chair of the Chief Information Officer (CIO) Committee at the Conference Board of Canada. Ms. Shortreed recently completed a term on the Board of the Natural Sciences and Engineering Research Council as well as the Digital Advisory Board to the CIO Branch of the Treasury Board of Canada. 

  • Wayne K. Stensby, Executive Vice President, Puerto Rico
    Wayne K. Stensby

    Wayne K. Stensby

    Executive Vice President, Puerto Rico


    Wayne Stensby is Executive Vice President, Puerto Rico. 

    In his role as Executive Vice President, Puerto Rico, Mr. Stensby is the President & CEO, LUMA Energy, a newly-formed company owned 50 per cent by Canadian Utilities Limited, an ATCO company, and 50 per cent by Quanta Services. LUMA will transform and operate Puerto Rico’s electric transmission and distribution system over a term of 15 years.

    Mr. Stensby joined ATCO in 1988 and has held a variety of leadership positions, including assignments in Canada, the U.K. and Australia. Most recently, in mid-2019, Mr. Stensby was appointed Executive Vice President, Corporate Development, where he was responsible for the growth of Canadian Utilities’ global portfolio of investments in premier energy infrastructure. In his Corporate Development role, he led the completion of the company’s Canadian fossil-fuel generation business divestiture, as well as the early completion and subsequent sale of Alberta PowerLine. Mr. Stensby initiated both strategic activities while in his previous role as Managing Director, Electricity, which he had held from 2015. Prior to this, he led ATCO’s Australian operations as Managing Director & Chief Operating Officer of ATCO Australia.

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

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

    Marshall F. Wilmot

    President, Retail & Chief Digital Officer

    Marshall Wilmot is President, Retail & Chief Digital Officer for ATCO and Canadian Utilities Limited. 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 and Canadian Utilities Limited’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 and Canadian Utilities Limited’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.