South Africa

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South Africa

401 Old Pretoria Rd, Midrand, 1685

T: +27 11 585 0000
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Meet the team

Deon Geyser

CEO - South Africa & CEO Liquid Networks: South Africa

Deon Geyser was appointed the Chief Executive Officer of Liquid Intelligent Technologies South Africa in 2021 and in 2022 he was appointed the Chief Executive Officer of Liquid Networks South Africa. He brings over 15 years’ experience in the ICT and Telco space, having worked in different countries across the African continent. He is responsible for the leadership, strategy, and operations in the country.

Before joining Liquid, Geyser was the MD for Nokia Southern Africa (2015 – 2020); he was responsible for the complete P+L for Nokia in the 13 countries in his region of responsibility. During his tenure, he was involved in several 4G and 5G launches, Network Virtualisation and Software transformation programmes, Fibre to the Home deals, IP and Optical network deals, and large-scale Managed Services contracts.

Under his dynamic leadership, Nokia Southern Africa was recognised as one of the top-performing regions in the MEA market consecutively for six years. His guidance also ensured his team was afforded the CEO award for the Best Business Partner by the Vodacom CEO twice.

Over the years, he has helped organisations succeed by developing and executing targeted strategies that ensure improved stakeholder returns. His passion for building an organisation with a clear vision and goals is repeatedly showcased in the success of all organisations that he led, be it Nokia or Tigo Tanzania, between 2012 – 2014.

Geyser holds three degrees, a bachelor’s degree in Electronic Engineering, a bachelor’s degree in IT, and a master’s degree in Engineering Management from the University of Johannesburg. He was also a part-time lecturer on the subject ‘Information Systems’ at the University of Johannesburg between 2001 – 2002.

Dr Craig van Rooyen

Chief Commercial Officer

Dr van Rooyen joined in September 2019 as Chief Operations Officer. He is directly responsible for strategic and operational leadership across the business.

He is passionate about using Liquid Intelligent Technologies’s extensive network and products to provide education, improve access to health and create jobs.

Craig previously held senior management and executive positions in large companies, such as SABC, Telkom and Vodacom, across commercial and technology functional divisions. He has achieved success in developing and selling solutions that enable telecommunications and broadcasting service providers to efficiently deliver high quality services over broadband access networks while leveraging investment in their network infrastructure. 

He holds a PhD in the Management of Technology, an MBA and National Technical Diploma in Telecommunications and is a member of the South African Institute of Electrical Engineers.

Steven Boiles

Chief Technology Officer - South Africa

Steven Boiles was appointed Chief Technology Officer for Liquid Intelligent Technologies, effective 9 February 2021. Steven has been working within group companies for almost 8 years. He brings a wealth of knowledge and skills in the Networks, Systems and Project Management disciplines acquired within the ICT sector across the globe.

Valencia Risaba

Chief Corporate Affairs Officer

Valencia is an admitted Attorney of the High Court of South Africa. A seasoned commercial lawyer and capable manager with over 15 years of experience, 8 of which were in the Telecoms industry, she currently heads up Regulatory Affairs and Corporate Services at Liquid Telecom South Africa.

She has served in legal and Regulatory roles in both the public and private sector, having worked in various capacities for a large State-Owned Entity (Eskom), and has a proven track record in the Telecoms sector in South Africa and African markets such as Nigeria, Uganda and Tanzania.

Key areas of expertise include Commercial Law, Legal due diligence in major funding transactions, Labour law, Regulation, Stakeholder Management and Corporate Governance.

Highlights and Qualifications

Valencia holds BProc and LLB degrees from the University of the Witwatersrand, a Higher Diploma in Corporate Law as well as a Masters’ degree in Business Leadership from UNISA.

Boyd Chislett

Chief Business Officer - South Africa

The ICT industry is renowned for its pace, commoditization, high customer demands and the necessity to manage, adapt and lead in a rapidly evolving economy and market. It is this experience and exposure in the ICT industry that has provided Boyd with the experience that allows him to operate in very diverse and challenging environments.

Boyd has a strong track record of delivery through managing large teams, strong customer relationships, structured management of customer experience and large scale multi Geography distribution.

Highlights and Qualifications

Executive - Advanced Management Program (Harvard Business School – Boston USA), Bachelor of Social Sciences (University of Natal)

Dr Willie Oosthuysen

Chief Strategy Officer

Dr Oosthuysen joined Liquid Intelligent Technologies in September 2019 as Chief Strategy Officer. In his current role, Dr Oosthuysen is responsible for the efficiency of business in collaboration with the Chief Executive Officer.

Since 1992, he has held various technical, management and executive roles for large corporates such as Sasol, Cisco, Altech and Altron, before starting his own consulting company, Africa ICT in 2017. 

He brings in-depth knowledge of the ICT sector and a wealth of experience in business strategy, mergers and acquisitions and digital business transformation to Liquid Intelligent Technologies SA.

Willie holds a PhD in Computer Science from the University of the Free State and an Executive MBA from the MIT Sloan School of Management.

Bronwen Zehmke

Chief Legal and Compliance/Company Secretary

Bronwen brings a wealth of experience to the organisation in overseeing complex legal and operational matters. She has managed large in-house legal and operational teams, including external legal panel firms and operational suppliers.  

Prior to joining Liquid Intelligent Technologies, Bronwen had a lengthy tenure at Absa / Barclays group, where she held a number of managerial ranks, including Head of Absa Group Legal HR, General Manager of Litigation and Legal HR. In 2O13, she became the Chief of Staff; Group Chairman, before occupying the role of Group Head of Board Support and COO to Group Company Secretary.
Bronwen holds an LLB degree (Cum Laude) and two Masters degrees in Law (LLM) and Business (MBA). She is also an admitted member of the High Court of South Africa and member in good standing of the Gauteng Law Society.

About us

As South Africa’s first converged telecommunications network operator, our customers are our first priority. That is why we have been tirelessly working since 2006 to deploy a nation-wide backbone fibre network that connects to over 40 cities and towns across South Africa. Today, we connect over 5,000 businesses and our network passes close to another 100,000 addresses. As part of the Liquid Intelligent Technologies Group, not only do we connect our customers to Africa over a single fibre connection, but our fibre optic backbone network ensures the highest levels of performance.
Together we are building Africa’s digital future.