Our Executive Management Team

Our Executive Management Team is responsible for leading the implementation of key strategic objectives for Cbus.

Kristian Fok, Chief Executive Officer

Kristian Fok

Appointment date: March 2023. Cbus member.



  • Bachelor of Commerce
  • Fellow of the Institute of Actuaries
  • Fellow of FINSIA

Career overview:

Kristian was appointed as Chief Executive Officer (CEO) in June 2023. He is responsible for all aspects of Cbus Super and reports directly to the Board.


Prior to his appointment as CEO, Kristian Fok served as the Fund’s Chief Investment Officer (CIO) for 10 years. As CIO, Kristian was responsible for leading the Cbus investment strategy and worked closely with the Investment Committee of the Board. This included evaluating the market and investment opportunities that provide returns to members over the long term, managing investment governance and risk, implementing the investment strategy and monitoring the portfolio. Kristian led the development and implementation of Cbus’ hybrid internalisation strategy, which was announced in May 2023. It has seen the management of 38% of fund assets brought in-house and provided total cumulative costs savings for members of over $500 million.


Kristian also serves on the Board of the Australian Council of Superannuation Investors and is Chair of the Australian Sustainable Finance Institute. Kristian’s qualifications include Bachelor of Commerce, Fellow of the Institute of Actuaries Australia and Fellow of FINSIA.

Marianne Walker, Deputy CEO and Chief Member Officer

Marianne Walker

Appointment date: 2019 (CMO) and 2023 (Deputy CEO). Cbus Member.



  • PROSCI Practitioner in Change Management
  • Certificate in Financial Management
  • Prince2 Foundation Certificate
  • Certificate in Direct Marketing

Career overview:

Marianne was appointed as Cbus Super’s Deputy CEO in June 2023 and is the Chief Member Officer. She joined the fund in 2019 to lead the member and employer experience division which supports services for our 900,000 members*. Marianne is a dedicated advocate driving change to deliver better quality retirement outcomes for Cbus members and their unique needs.


Prior to joining Cbus, Marianne was the Executive Director of Customer Support at the Victorian Department of Health and Human Services and has provided executive leadership for over two decades in industries including finance, logistics, utilities, energy and banking. She is respected for steering organizations through successful transformation, driving business and commercial performance.


She is also a Board Director of The Royal Women’s Hospital in Victoria.


*as at 12 May 2023


Brett Chatfield, Chief Investment Officer

Brett Chatfield

Appointment date: June 2023. Cbus Member.



  • Master of Applied Finance
  • Graduate Diploma of Science (Applied Statistics)
  • Bachelor of Business (Accountancy) with Distinction

Career overview:
Brett Chatfield joined Cbus Super in February 2013 and prior to the Chief Investment Officer appointment had been Deputy Chief Investment Officer since June 2019. Brett will be responsible for leading Cbus’ new 5 year investment strategy and working closely with the Investment Committee of the Board.


As Deputy Chief Investment Officer, Brett held overall responsibility for asset allocation, public and private markets, responsible investing, and strategy and innovation. Brett has been a key driver of the build out of the Fund’s investment internalisation strategy, which has since a significant portion of asset management brought in-house since 2017 and total cumulative costs savings for members of over $500 million.


Prior to joining Cbus, Brett worked in investment consulting, institutional investment management, and research, including roles with Frontier Investment Consulting, Challenger, UniSuper, and Lonsec, and prior to that worked in the superannuation group at KPMG.

Belinda Langdon, Acting Chief Risk Officer

Belinda Langdon

Appointment date: January 2024. Cbus Member.



  • Graduate Company Directors Course, Australian Institute of Company Directors
  • Graduate Diploma of Chartered Accounting
  • Bachelor of Business (Professional Accountancy) with Distinction

Career overview:

Belinda is a risk management professional with over 18 years experience working both locally and internationally, primarily in the financial services sector. She has extensive experience providing assurance and risk consulting and successfully navigating organisations through strategic, operational and regulatory changes.


Prior to her appointment as Acting Chief Risk Officer, Belinda led the Enterprise Risk Management team at Cbus including regulatory engagement for the Fund.


Belinda joined Cbus in 2020 from KPMG where she was a Director leading a range of assurance and risk consulting services across the Asset and Wealth Management industry.

Alexandra West, Chief Strategy Officer

Alexandra West

Appointment date: September 2023. Cbus member. 



  • Masters of Public Administration, Harvard University, Menzies Scholar
  • Bachelor of Laws and Arts (First Class Honours), University of Melbourne 

Career overview:
Alexandra was appointed to the role of Chief Strategy Officer in September 2023. She has been instrumental in the successful transformation of Cbus’ investment business strategy and model, serving as the Fund’s Chief Strategy Officer, Investments for seven years.


Alexandra brings international leadership experience in financial services and superannuation – including roles with Fidelity Investments US, McKinsey & Company and Herbert Smith Freehills.


Alexandra also serves on the UN PRI Sustainable Development Goals advisory committee. Alexandra holds an Arts/Law degree from the University of Melbourne, and a Masters of Public Administration from Harvard University where she studied as a Menzies Scholar.

Natalie Hannemann, Chief Transformation Officer

Natalie Hannemann

Appointment date: September 2023. Cbus member. 



  • Bachelor of Commerce – Deakin University
  • Bachelor of Education – Deakin University 

Career overview:
Natalie Hannemann is the Fund’s Chief Transformation Officer, driving operational excellence across the business to better service members and increase efficiencies.


Natalie is a member-centric executive with extensive experience transforming complex business environments and operating models. Since joining Cbus three years ago, she has held the role of Head of Service, enhancing the operational service model to achieve an integrated experience for Cbus members and employers.


For over two decades, Natalie has delivered transformation programs across the superannuation, health insurance and not-for-profit sectors, including leadership roles at World Vision and Bupa.

Nancy Day, Chief Operating Officer

Nancy Day

Appointment date: September 2023. Cbus member. 



  • Bachelor of Business (Accounting), RMIT
  • Graduate, Australian Institute of Company Directors
  • Fellow CPA, CPA Australia

Career overview:
Nancy Day is the Fund’s Chief Operating Officer with responsibility for all operational and enabling functions of Cbus including investment enablement, finance and technology.


Nancy was previously Cbus’ Chief Operating Officer, Investments for three years, leading the investment enablement team and build out of capability to support the Investment internalisation strategy at Cbus. She also held the position of Head of Investment Operations for two years.


Nancy joined Cbus from JCP Investment Partners and has two decades of experience operationalising strategy and managing business operations in the financial services and superannuation sector, leading a wide range of functions including investment operations, governance and risk management, finance and technology.

Justine Hartman, Chief People Officer

Justine Hartman

Appointment date: September 2023. Cbus member. 


Career overview:
Justine Hartman is Cbus Super’s Chief People Officer, the position and title reflecting the importance of our people being represented on the Executive team. Justine drives the culture and employee experience at the Fund, critical for continued long term success.


Justine has held senior talent and employee experience leadership roles at Cbus for nine years and has been Acting Group Executive People & Culture in 2023. She is dedicated to fostering growth and employee excellence, combined with a proven track record of enhancing organisational culture, diversity and talent at the Fund.


Justine has two decades of expertise in the superannuation industry and people and culture roles, joining Cbus from Superpartners, and prior to that held senior P&C roles in a variety of industries.

Further reading

You can read more about our Executive Management Team by clicking on the links below.