Knut Karlsen

Knut is an engineer from the Norwegian University of Science and Technology and holds an MBA from IMD in Switzerland. He was recently the CEO of Umoe Bioenergy, producing biofuel and electricity from sugar cane in São Paulo in Brazil. Knut also sits on the advisory board of Copersucar S.A., the world’s largest sugar and ethanol trader. Prior to joining Umoe Bioenergy, Knut was the President of Yara Brasil, the Brazilian subsidiary of Yara International.

Knut joined Yara from PwC, where he was a Partner in the firm’s consulting group.


Petter Østbø

Petter started Atlas Agro with Knut in 2021 to make zero-carbon fertilizer available to farmers everywhere. He has a background on a CxO level from the largest fertilizer producers in the world, having been COO and CFO in Yara International and group CEO in EuroChem AG, after a period as Associate Principal in McKinsey & Co. Petter has overseen the production of more than 50 plants and mines worldwide, as well as the construction of more than a dozen world-scale plants and mines. He’s the author of a book on productivity, and led six major productivity transformations across commercial, supply chain operations, capital projects and support functions in chemicals, metals and mining, with more than a billion USD in demonstrated improvements. Petter spends his spare time cycling or skiing in the Swiss Alps.

Kate Vidgen

Executive Director, Head of Industrial Transition and Clean Fuels

  • Joined Macquarie in 1998
  • Based in Queensland


Kate is Head of Industrial Transition and Clean Fuels for MAM Green Investments.

The key area of investment focus is the energy transition and enabling more traditional industries to accelerate their decarbonisation and leverage from existing infrastructure. Kate undertakes a variety of governance and leadership functions across Macquarie, which includes serving as the Chair of the Macquarie Group Climate Solutions Taskforce. She sits on the board of Blueleaf Energy, an Asian solar and onshore wind developer owned by MAM Green Investments, and the Hydrogen Chemistry Company in the Netherlands.

Kate is a member of the Australian Clean Energy Regulator Board and supports a number of not-for-profit and industry associations, including sitting on the Council of Bond University in Queensland and being a member of the Hydrogen Sub-Committee of the Australia Korean Business Council.

Prior to joining Macquarie, she was a Solicitor specialising in the energy sector and project finance.

Kate has a Bachelor of Laws (Honours) and a Bachelor of Arts from Bond University, and she is a Graduate of the Australian Institute of Company Directors.


William Gerald Demas

Senior Managing Director, Head of Americas – MAM Green Investments

  • Re-joined Macquarie in 2022
  • Based in New York City

Will is Head of Americas for MAM Green Investments.

Will re-joined Macquarie from Stonepeak Partners, where he was instrumental in leading the firm’s renewable energy and energy transition investment activities in the Americas. Prior to Stonepeak, he headed Copenhagen Infrastructure Partners in the Americas. Before that, Will was a Senior Vice President of Macquarie Capital’s Renewable Energy Principal and Investment and Advisory Team.

He is on the board of directors of the American Council on Renewable Energy, Calibrant Energy, and Treaty Oak Clean Energy. He is also Chairman of the Advisory Board of America Needs You, an organization that fights for economic mobility for ambitious, first-generation college students by providing transformative mentorship and intensive career development.

Will earned a Bachelor of Arts in economics from Harvard University.