Our Management

Pieter Krügel, ACA, BFP, CA(SA)

Chief Executive Officer and executive director
Pieter-Krugel

Pieter Krügel is the Chief Executive Officer and Executive Director at Mast Energy Developments (MED). Pieter previously worked as the Group Chief Financial Officer of the Kibo Group, where he has leveraged his experience in capital raising, corporate restructuring, economic analysis, IFRS reporting and strategic planning to contribute to the growth of the Group. Prior to this, he held senior financial and executive roles over the course of 15 years, with specific reference to the energy and resources industries. He is a qualified chartered accountant and a member of the Institute of Chartered Accountants in England and Wales (ICAEW). Pieter has been intimately involved in the MED business since the Group’s initial acquisition of MED in 2018 as well as its involvements in the flexible-power market. He was also part of the core team that led to the successful IPO of MED in 2021.

Ivan Wentzel

OPERATIONS MANAGER

Ivan Wentzel holds a B.Eng (Electrical & Electronic) from the University of Johannesburg and has been registered with the Engineering Council of South Africa (ECSA) since 2010. After graduating, Wentzel worked as a Project Engineer at various well-known and respected global engineering project houses and consultancy firms.
In 2015, he started his first private company focused on the field of industrial automation and project engineering. The company was acquired two years later, with Wentzel staying on as Head of Department for Software Solutions. In 2017, he co-founded two companies: an Internet of Things (IoT) business, his stake of which he sold in 2022, and a project engineering company based in Mauritius, which closed in 2020 due to the impacts of COVID-19.

Wentzel is now the Operations Manager at Mast Energy Developments (MED), a net-zero flexible power company listed on the Standard List of the London Stock Exchange (LSE: MAST).

Tanya Zwemstra CA(SA)

FINANCIAL MANAGER

Tanya Zwemstra is a qualified chartered accountant registered with the South African Institute of Chartered Accountants (SAICA) and the financial manager at Mast Energy Developments (MED). She worked at KPMG for 18 years, servicing private and public clients. Here, she gained experience in various industries, including mining, healthcare, transport, education and entertainment.

Tanya furthermore has experience in providing services to large donor-funded organisations, working on five different country/regional portfolios, including South Africa. She has been involved in performing capacity assessments at recipient organisations, evaluation budgets, reviewing progress reports, assisting with grant-making and closure reconciliations, and reviewing financial assurance plans for sub-recipients. Her experience also includes operation clean-audit assignments and policy and procedure reviews.