Isaac Tosu has been promoted to Vice President of Supply Chain for Africa at Diageo, a move he announced on 12 October 2026. Since May 2024 he had run supply chain for 36 countries in Southern, West and Central Africa, and the new role, which began this month, extends his remit to the whole continent.
Tosu will lead integrated business planning, capital investment planning and governance, third-party operations partnerships and customer service. Diageo has been selling its African brewing stakes. It sold its stake in Guinness Nigeria to Tolaram in 2024 and its 80.4 per cent of Guinness Ghana Breweries to Castel in 2025, and agreed in December 2025 to sell its 65 per cent of East African Breweries (EABL) to Asahi for net proceeds of $2.3 billion.
Brands without the breweries
Diageo kept the brands in each sale and licensed them back to the buyers. Guinness Ghana still brews Guinness, Malta and Orijin under a royalty agreement, and EABL will make Guinness, local spirits and ready-to-drink products under licence once the Asahi deal closes. Diageo calls this an asset-light beer model.
That model makes outside plants part of the supply chain Tosu now runs. His profile lists third-party operations partnerships, meaning arrangements in which other companies make Diageo products, as one of four areas he leads, alongside planning, capital investment and customer service. The profile does not say how many partner plants are involved.
From engineer to executive
Tosu joined Guinness Ghana Breweries as engineering manager in 2012, ran its Achimota brewery as factory manager, and became its supply chain director, a post he held until early 2021. He then served as a director at Guinness Nigeria until May 2024, and Diageo announced the sale of its stake in that company to Tolaram a month later.
His profile lists more than 20 years in fast-moving consumer goods and brewing, an MBA from the Ghana Institute of Management and Public Administration and a mechanical engineering degree from Kwame Nkrumah University of Science and Technology. Those details are self-reported.
What remains unsettled
Kenya’s competition regulator approved the EABL sale with conditions on 11 September 2026, and Diageo expects completion by 31 December 2026, after which Asahi takes majority control of the brewer in Kenya, Uganda and Tanzania. Until then it remains Diageo’s last major African beer business.
No targets, investment figures or timetable have been published with the promotion. What the title changes is scope. Tosu now answers for supply across Africa while the plants making Guinness in Nigeria and Ghana are controlled by other companies, and the Kenyan ones are due to follow.
