Board committees
Audit committee
![George Cavaleros [photo]](/images/omnia/dir-george-cavaleros.jpg)
George Cavaleros
- Qualifications
- CA(SA), CFA, ACIS, CIA, CISA, M.Com (Applied Risk Management)
- Designation
- Independent non-executive director
- Date of appointment
- 5 August 2019 - Audit committee
- 5 August 2019 - Board
- 16 October - Remuneration and nominations committee
- 1 February 2021 - Audit committee (chair)
- Board committee membership
- Remuneration and nominations committee
- Audit committee
- Significant directorships
- Accelerate Property Fund Limited
Sygnia Limited - Number of non-significant directorships
- 0
Skills and expertise: External and internal audit, finance and accounting, risk management, controls, corporate governance
Experience: George retired from Deloitte during 2015 after a 30-year career with the firm. As a financial services industry partner, George provided audit and a variety of other professional services to clients including life insurance and re-insurance companies, asset managers, hedge funds and other finance entities. Currently, George serves as an independent non-executive director on the board of Accelerate Property Fund Limited, a listed real estate investment trust (REIT), where he is a member of the audit and risk, remuneration, and nominations committees.
George is also the lead independent non-executive director of a financial services group, Sygnia Limited, and chairs the group’s audit and risk committees.
Previously, George held audit committee leadership positions at a medical scheme and a leading South African university.
![Tina Eboka [photo]](/images/omnia/tina-eboka.jpg)
Tina Eboka
- Qualifications
- BSc (Industrial Eng, Textile Eng), MBA
- Designation
- Independent non-executive director
- Date of appointment
- 25 February 2016 - Board
- 14 March 2018 - Audit committee
- 30 March 2021 - Social, Ethics and Risk Committee
- Board committee membership
- Audit committee and Social, Ethics and Risk Committee
- Significant directorships
- TymeBank, TymeHolding and Pragma
- Number of non-significant directorships
- 2
Skills and expertise:Business management, finance, strategy, engineering, corporate and social affairs
Experience: Tina is currently Group managing director of NTP Radiosotopes (SOC) Limited, the commercial subsidiary of NECSA. She is the current vice chair of the OECD -NEA committee of medical radioisotopes. Her work experience in private and public sectors includes banking, science/technology research, retail and manufacturing sectors.
She is a recognised business turnaround specialist who has served as executive director of Standard Bank responsible for setting up group corporate affairs, previously was vice president at CSIR; a senior manager in textiles and stakeholder management at Woolworths and as head of engineering in a manufacturing firm in the USA. Tina has served on other listed boards previously.
![Ronald Bowen [photo]](/images/omnia/dir-ronald-bowen.jpg)
Ronnie Bowen
- Qualifications
- BSc (Hons)
- Designation
- Independent non-executive director
- Date appointed to board
- 28 September 2011
- Board committee membership
- Audit committee
- Significant directorships
Skills and expertise: Business management, strategy, global & local governance, Chemicals industry, finance
Experience: Former senior executive, managing speciality chemical businesses on 5 continents for Süd-Chemie AG, Germany for 30 years. He also worked for Ashland Chemicals Inc. of the United States. He has served on several boards, both locally and internationally, as managing director, executive director and chairman with joint-venture shareholders such as Sasol Limited, the Industrial Development Corporation, Central Energy Fund (CEF) Limited and PetroSA. He is a council member of a large global marketing consultancy and a member of the Institute of Directors in Southern Africa (IoDSA).
![Willem Plaizier (Wim) [photo]](/images/omnia/dir-willem-plaizier.jpg)
Willem (Wim) Plaizier
- Qualifications
- BSc, MBA
- Designation
- Independent non-executive director
- Date of appointment
- 11 February 2019 - Board
- 30 March 2021 - Audit Committee
- Board committee membership
- Audit Committee
- Significant other directorships
- None
Skills and expertise: Business management, strategy, supply chain operations, chemicals & mining industry
Experience: Wim has over 35 years’ industry and strategic management consulting experience across predominantly the Chemicals, Energy, Oil & Gas, Agriculture, Pulp & Paper and Metals & Mining sectors. He also brings significant international experience to the board, with more than 13 years’ in Africa. Among other roles during his career, Wim most recently served as a Partner at A.T Kearney where he was responsible for, inter alia, the African region and at a global level strategy, business planning, productivity and operations. He retired in 2017 after 21 years within the group and served from September 2018 till December 2019 as interim COO of African Parks, a nature conservancy. He is currently and independent advisor, coach and interim manager.
![Ronel van Dijk [photo]](/images/omnia/dir-ronel-van-dijk.jpg)
Ronel van Dijk
- Qualifications
- CA(SA)
- Designation
- Independent non-executive director
- Date of appointment
- 1 May 2022 - Board
- Board committee membership
- Audit Committee
- Significant other directorships
- Adcorp Holdings Ltd, Grand Parade Investments Ltd, Burger King South Africa
Skills and expertise: Finance, business management
Experience: Ronel is a CA(SA), having obtained a BAcc (Hons) from the University of Stellenbosch and completing articles with Arthur Andersen, where she attained the role of audit manager. In 2003, she joined the Spur Corporation Limited as its Financial Manager, whereafter she was promoted to Chief Financial Officer. After fifteen years with the Spur Corporation, Ronel decided to step away from corporate life and became a freelance consultant.
Remuneration and nominations committee
![Thoko Mokgosi-Mwantembe [photo]](/images/omnia/dr-thoko-2018.jpg)
Thoko Mokgosi-Mwantembe
- Qualifications
- Diploma in Teaching (Swaziland), B.Sc (Swaziland), M.Sc (Loughborough UK), SEP (Harvard USA), MCRP (IMD Switzerland)
- Designation
- Independent non-executive director
- Date of appointment
- 1 June 2018 - Board
- 1 August 2018 - Remuneration committee and nominations committee
- Board committee membership
- Remuneration and nominations committee (chair)
- Significant directorships
- Royal Bafokeng Platinum,
Old Mutual - Number of non-significant directorships
- 8
Skills and expertise: Business management, chemistry, information systems, strategy
Experience:Thoko holds a BSc and Teaching Diploma from Swaziland and a master’s degree in Medicinal Chemistry from Loughborough University in the UK. She serves as an independent non-executive director on the boards of a number of JSE listed companies. In 2005 she was named finalist for IT Personality, winner of Top ICT Individual and winner of Top ICT Businesswoman in Africa. In 2007, she was named the Businesswoman of the year in the Corporate Category.
![George Cavaleros [photo]](/images/omnia/dir-george-cavaleros.jpg)
George Cavaleros
- Qualifications
- CA(SA), CFA, ACIS, CIA, CISA, M.Com (Applied Risk Management)
- Designation
- Independent non-executive director
- Date of appointment
- 5 August 2019 - Audit committee
- 5 August 2019 - Board
- 16 October 2019 – Remuneration and nominations committee
- 1 February 2021 - Audit committee (chair)
- Board committee membership
- Remuneration and nominations committee
- Audit committee
- Significant directorships
- Accelerate Property Fund Limited
Sygnia Limited - Number of non-significant directorships
- 0
Skills and expertise:External and internal audit, finance and accounting, risk management, controls, corporate governance
Experience: George retired from Deloitte during 2015 after a 30-year career with the firm. As a financial services industry partner, George provided audit and a variety of other professional services to clients including life insurance and re-insurance companies, asset managers, hedge funds and other finance entities. Currently, George serves as an independent non-executive director on the board of Accelerate Property Fund Limited, a listed real estate investment trust (REIT), where he is a member of the audit and risk, remuneration, and nominations committees.
George is also the lead independent non-executive director of a financial services group, Sygnia Limited, and chairs the group’s audit and risk committees.
Previously, George held audit committee leadership positions at a medical scheme and a leading South African university.
![Ralph Havenstein [photo]](/images/omnia/dir-ralph-havenstein.jpg)
Ralph Havenstein
- Qualifications
- BCom; MSc (Chem Eng)
- Designation
- Chairman
- Date appointed to board
- 6 November 2007
- Board committee memberships
- Social, ethics and risk committee and Remuneration and nominations committee
- Significant JSE listed directorships
- Northam Platinum Limited, Murray & Roberts Holdings Limited
- Number of non-significant unlisted directorships
- 2
Skills and expertise: Engineering, governance, risk management, strategy, chemicals and mining industry
Experience: Previously served as director of Anglo Platinum, Northam Platinum, Mintek and Sasol and on councils of Chamber of Mines and Chemical and Allied Industries' Association (CAIA).
Social, ethics and risk committee
![Ralph Havenstein [photo]](/images/omnia/dir-ralph-havenstein.jpg)
Ralph Havenstein
- Qualifications
- BCom; MSc (Chem Eng)
- Designation
- Chairman
- Date appointed to board
- 6 November 2007
- Board committee memberships
- Social, ethics and risk committee and Remuneration and nominations committee
- Significant JSE listed directorships
- Northam Platinum Limited, Murray & Roberts Holdings Limited
- Number of non-significant unlisted directorships
- 2
Skills and expertise: Engineering, governance, risk management, strategy, chemicals and mining industry
Experience: Previosly served as director of Anglo Platinum, Northam Platinum, Mintek and Sasol and on councils of Chamber of Mines and Chemical and Allied Industries' Association (CAIA).
![Bernard Swanepoel [photo]](/images/omnia/dir-bernard-swanepoel.jpg)
Bernard Swanepoel
- Qualifications
- BSc Mining Engineering; BCom Hons
- Designation
- Independent non-executive director
- Date of appointment
- 1 October 2019 - Board
- 23 September 2020 - Social, ethics and risk committee (chair)
- Board committee membership
- Social, ethics and risk committee (chair)
- Significant other directorships
- Impala Platinum Holdings Limited, Zimplats Holdings Limited
Skills and expertise: Engineering, finance, business management, strategy
Experience: He began his career with Gengold in 1983, subsequent to which he was appointed as General Manager of Beatrix Mines in 1993. After joining Randgold & Exploration Company Limited as Managing Director of the Harmony mine in 1995, Bernard was appointed as Chief Executive Officer of Harmony Gold Mining Company Limited in 1997, a role he held for ten years before launching To The Point Growth Specialists, which operates in the mining and resources sectors, specialising in identifying opportunities, unlocking value and driving growth.
![Tina Eboka [photo]](/images/omnia/tina-eboka.jpg)
Tina Eboka
- Qualifications
- BSc (Industrial Eng, Textile Eng), MBA
- Designation
- Independent non-executive director
- Date of appointment
- 25 February 2016 - Board
- 14 March 2018 - Audit committee
- 30 March 2021 - Social, Ethics and Risk Committee
- Board committee membership
- Audit committee and Social, Ethics and Risk Committee
- Significant directorships
- TymeBank, TymeHolding and Pragma
- Number of non-significant directorships
- 2
Skills and expertise:Business management, finance, strategy, engineering, corporate and social affairs
Experience: Tina is currently Group managing director of NTP Radiosotopes (SOC) Limited, the commercial subsidiary of NECSA. She is the current vice chair of the OECD -NEA committee of medical radioisotopes. Her work experience in private and public sectors includes banking, science/technology research, retail and manufacturing sectors.
She is a recognised business turnaround specialist who has served as executive director of Standard Bank responsible for setting up group corporate affairs, previously was vice president at CSIR; a senior manager in textiles and stakeholder management at Woolworths and as head of engineering in a manufacturing firm in the USA. Tina has served on other listed boards previously.